Walkthrough (Below Zero)

This page serves as a full-game survival mode walkthrough of Subnautica: Below Zero. It also contains gameplay tips and helpful pointers for successfully mastering the oceans. Keep in mind that this page will have spoilers, as it also summarizes the events as you follow along the story. Note that if at any point in the playthrough you become unable to progress due to a bug, check Console Commands to see if any commands can help.

Background
You play as Robin Ayou, a Xenoworker who is part of an Alterra Initiative on the planet 4546B. Robin's mission is to find her sister, Sam Ayou, who is also a Xenoworker exploring on 4546B.

Intro site
The story starts with Robin crashing in a stolen shuttle. After the intro cutscene, you gain control of Robin. You can use the    keys to walk,  to sprint, and move your mouse to look around. You will get a Databank Entry. The game instructs you to press to open the PDA in order to check the entry, which is an essential tool in Subnautica: Below Zero. There are some supplies on the ground, such as Filtered Water Bottles, Flares and Nutrient Blocks. While exploring outside the water you should pay attention to your body heat. If hypothermia becomes imminent, you can warm yourself up with the help of Thermal Lilies. You can cross a path to an open water area from which you can swim to the Drop Pod.

Stranded
The path exits into the main area of gameplay, known as Sector Zero. The exact biome you are now in is the Shallow Twisty Bridges. At this point, your food bar should be at about half. Food and water are two core gameplay threats that need to be managed constantly. To refill food and water, Robin must eat cooked fish, which can be made using caught fish at a Fabricator, eat Cured Fish, which are made from fish and Salt Deposits, and drink Filtered Water, which can be crafted using Bladderfish. Also present is the health bar, which monitors how much damage you can take before dying. Damage usually comes from predatory fauna or flora, though it can also be caused by fall damage and excessive heat. Healing requires the use of First Aid Kits, but health will also slowly regenerate if you've refilled your food and water meters enough. Finally, the last two indicators are Oxygen and Temperature. Oxygen slowly runs out at a pace of 1 unit per second (unless your depth is below 100 meters and you don't have a Rebreather equipped) when underwater and in bases/vehicles without power. Temperature, on the other hand, decreases when outside of water and in cold environments. Note that the speed at which temperature decreases depends on the biome and the current weather.

Shortly after exiting the path, Robin arrives at the Drop Pod, a safe location for Robin to store and craft items. Inside the Drop Pod is a 6&times;8 storage locker and a Fabricator, one of the most essential crafting machines in the game. The Fabricator has four tabs: Resources, for crafting items that are used to craft final products; Sustenance, for crafting food and water; Personal, for crafting Equipment and Tools; and Deployables, useful items that are placed into the world and have a handy effect. Right now, there are three items of vital importance to craft: the Survival Knife, the Scanner, and the Standard O₂ Tank.

Important Tools
The quickest tool to craft is the Scanner. Its recipe is one Battery and one Titanium. Titanium can be acquired by breaking open Limestone Outcrops, which litter the floor and walls of many biomes, including the one you are currently in. The outcrops also drop Copper Ore, which is required to craft batteries. The other resources needed for batteries are two Ribbon Plants, which are small, narrow, yellow and green plants generally found in the caves of the Shallow Twisty Bridges. Once you have all the items you need, return to the Drop Pod to craft the Scanner. The Scanner allows you to scan fauna, flora, rocks, and most importantly, Fragments. Fragments are broken pieces of technology that litter the floors of many biomes. Each biome has a different array of fragments. One very useful piece of technology that can be scanned in the Shallow Twisty Bridges is the Seaglide, which greatly increases your movement speed. Note that it and the Scanner require a charged battery to operate. If your tool runs out of power, simply craft another battery and replace it by pressing while holding the tool. Later on in the game you'll be able to create a Battery Charger and place it in your base to recharge the batteries you have.

The next important item is the Survival Knife. The knife allows you to collect certain resources and fight off aggressive life forms should the need arise. The knife's recipe is one Titanium and one Silicone Rubber. Silicone Rubber can be crafted by harvesting a Seed Cluster in the Arctic Kelp Forest. One of the forests can be found in the direction away from the tunnel. Once you make your way there, the seed clusters are bright red bulbs hanging off the tall Creepvines, which resemble real-life kelp. It is prudent to harvest as many as you can carry, as you will need more later. Once you have everything you need, head back to the Drop Pod to fabricate the knife.

The third item that is necessary to craft is the Standard O₂ Tank. The tank increases your total oxygen, allowing you to stay underwater much longer. Its crafting recipe is two Titanium and a Fiber Mesh. Fiber Mesh is crafted using two Creepvine Samples, which can be acquired by using the Survival Knife on a Creepvine in the Arctic Kelp Forest. To use the knife, simply equip it using the number keys and then click. Once you craft the tank back at the Drop Pod, several more crafting recipes will be unlocked.

Supplies
After entering the Drop Pod for the first time, the PDA locates an emergency supply cache in the Arctic Kelp Forest and adds the beacon to Robin's PDA. The supply cache contains the blueprint for the Compass, which puts a compass on the player's HUD. The beacon for the cache can be turned off in the beacons tab of the PDA or taken to be placed in another point of interest. Something you should take the time to craft is the High Capacity O₂ Tank, an upgraded version of the Standard O₂ Tank you previously crafted. Though not absolutely necessary to progress, if you are an unexperienced player it is recommended to craft this upgrade. The blueprint for it can be found in the Twisty Bridges; just explore until you find it, or skip to the next section if you can go without. Its recipe calls for four Titanium, two Glass, and one Silver Ore. Glass is crafted by combining two Quartz. You may have already seen quartz; it is a white, crystalline object found on the floors of the Shallow Twisty Bridges and the barren Sparse Arctic (which you passed through to find the cache). In total, you need four quartz for the tank. Silver ore is more tricky to find; it is available in the Arctic Kelp Caves and the Twisty Bridges. The former is safer, as it has no predators, but can be easy to get lost in. It is also significantly easier to find the Twisty Bridges, as they are just trenches surrounded by some parts of the Shallow Twisty Bridges, whereas Arctic Kelp Caves entrances are few. Whichever you decide, you must look for Argentite Outcrops, which are grey rocks protruding from the surface of walls. Once you have everything you need, head back to the Drop Pod to craft the tank. Remember to take off your old tank in order to craft the new one.

Finding the Sanctuary
At some point, the PDA will notify Robin that there is a nearby alien Sanctuary that she should explore. The sanctuary is located deep in the Twisty Bridges, at a depth of 180m. You can find the entrance by going farther away from the Drop Pod, opposite the direction of the tunnel. Once you get near the sanctuary, you may see some alien pillars. Follow the pillars to find the sanctuary, which is another large alien structure with a wide, square opening. Going through the opening will take you out of the water and back onto your feet.

The Download
The first thing in front of you is the cave of the sanctuary. The entrance to the inner sanctuary contains three Ion Cubes, which you may want to pick up as they are not very common. Be sure not to waste them as they will be required to progress, though more can be found around Sector Zero. Follow the rocky path to get to the inner sanctuary, which is marked by more alien structures. Inside the inner sanctuary is a large, open room with a giant cube-like structure in the center. Along the way, you'll get a message telling you the facility's power is low. An alien, disembodied voice speaks to Robin and says it is running out of time. The facility tells Robin that "a storage capacity is found on her person". Go around the cube and up the ramp to find a green hologram. Interacting with the hologram initiates a cutscene in which an Architect consciousness is downloaded into Robin's brain. Once Robin regains consciousness, she and the alien talk to each other and Robin becomes upset about what happened. The alien becomes silent while it thinks of a solution for their current situation. Finally, the Sanctuary Cube collapses. You can now exit the sanctuary.

The Delta Island
After Robin exits the Sanctuary, the Architect's voice tells her it needs a body to transfer itself into. The voice tells her it belongs to a species called the Architects. Robin asks for its name, so it tells her she may append her seed code to his species designation. The voice concedes that Robin may call it Al-An. After this exchange, the next step in the story is to head to the Delta Island, an island in the center of Sector Zero that holds the Radio Tower, a large installation to monitor Alterra employees in Sector Zero. Head towards the island, which can be seen from a fair distance to the South (away from the tunnel and mountains).

When you get to the island, you must then climb it towards the top where the tower resides. Go through the caves to reach it. It is at this point that the player will most likely face the dangers of hypothermia for the first time. On the Delta Island, Thermal Lilies provide a very convenient source of heat that makes surviving the island very easy. On her way to the top, Robin will trigger a cutscene involving Marguerit Maida, who tells her to stay off her land and then leaves in her modified Prawn Suit.

Rocket Island Base
Once at the top of the island, you will most likely see Delta Station before seeing the tower. By the base is a fragment of Habitat Builder. The habitat builder allows Robin to build Seabases in the water or on land. Seabases allow you to have a base away from the Drop Pod, which can contain storage and useful facilities such as a Fabricator. See Seabases and Hull Integrity for more information.

There are also certain scannable objects in the base. Most do not have a use other than vanity, however two specific objects stick out as extremely useful; the Multipurpose Room and the Modification Station. The room can be scanned from the outside (it is the large round room, there are two of them), and the Modification Station is found inside the bedroom of the base. It can be used to build upgrades to certain equipment and tools, such as the knife and the oxygen tank. After scanning everything you need or want, exit the base and head up the stairs in front of you to the radio tower.

Repairs Required
Observation of the radio tower reveals that it is damaged, and that it requires two specific components to be repaired. First, you need to craft a Repair Tool, which has a recipe of one Silicone Rubber, one Titanium, and one Crystalline Sulfur. The sulfur can be acquired back in the Twisty Bridges or on the Rocket Island itself (the latter is a much easier source). Look for protrusions on the walls of the Twisty Bridges that open up when you get close. When you approach them, a Crashfish will swim out and chase you; make sure to swim away as fast as possible as it will explode after a few seconds. Once the fish is dead, you can return to its home, the Sulfur Plant, and grab a crystalline sulfur from it. Crystalline Sulfur can also be located in the caves on the Rocket Island. You should now be able to craft the Repair Tool, however it is not the only item required to repair the radio tower.

Seatruck
At this point, the story will force you into deeper sections of the region. It is highly recommended to acquire the Seatruck, a submarine that can be modified to suit your needs using attachable and detachable modules. The first step is finding its Fragments, which can be found in the Twisty Bridges and Thermal Spires. They are more easily located in the Thermal Spires, the biome immediately surrounding the Rocket Island. Once you scan three pieces, you'll unlock the Seatruck; however, you also need the Mobile Vehicle Bay, which allows you to build vehicles. These fragments (you need three) can be found in the Twisty Bridges as well, however they are more common in the Arctic Kelp Caves, which are large caves whose entrances are in the Arctic Kelp Forest. Be prudent when diving here; Sea Monkeys can steal your held item, and it may be difficult to find your way out.

Once you have both blueprints, it's time to craft both. The Mobile Vehicle Bay calls for one Titanium Ingot, one Lubricant, and one Power Cell. All three are easily crafted; the Titanium Ingot simply requires ten Titanium, and the Power Cell needs two Batteries and a Silicone Rubber, which you have crafted before. Once you've crafted the bay, simply equip it and drop it in somewhat deep water and it'll float to the surface and open. Climb on by clicking it and click again to open the crafting menu.

Next, you need to craft the Seatruck itself, which is more difficult to acquire the ingredients for. It calls for another Titanium Ingot, two Advanced Wiring Kits, two Glass, and three Lead. Titanium Ingot and Glass are simple; the rest, however, should be new to you. Advanced Wiring Kits require a Wiring Kit (which require two Silver Ore), two Gold, and a Computer Chip each. Most of these you've seen before; they can be found from nodes all over the region. Table Coral Samples, however, are quite rare. They can be found by cutting Table Corals, which are flat corals found in the Twisty Bridges. They are rare, so keep looking, and pay special attention to the walls of the biome. After you manage to find those, you need Lead. They can be found quite easily from Lead Outcrops in the Thermal Spires and Twisty Bridges. As usual, the former is more reliable.

Once you've managed to get all the materials needed to craft the Seatruck, head back to your Mobile Vehicle Bay, or drop it back down if you picked it up. Climb on and craft the Seatruck. After a short animation, it'll be dropped in the water in front of you. You can enter it through a hatch on the roof. The Seatruck runs on Power Cells, which need to be charged up in Power Cell Chargers; alternatively, you can build a Moonpool to charge your Seatruck while docked. The Seatruck is controlled much in the same way as the player; mouse to look around, to move. Pressing backward will also turn on a rearview mirror, which can be disabled by pressing forward again. The main feature of the Sea Truck is modularity; using Seatruck modules, you can pick and choose what your Seatruck can do, from storage to teleportation. It is also upgradeable using upgrades crafted in the Seatruck Fabricator Module. The modules and upgrades must both be unlocked through more exploration, though some upgrades are unlocked by default. See the Seatruck page for more information on modules and upgrades.

Salvaging
Radio Tower 7 also requires two important components; an Advanced Wiring Kit and the Ship Wreck Salvage. Before you look for the salvage you will need one vital tool; the Laser Cutter, which allows Robin to cut open damaged doors and containers. Its blueprint is found solely in the Arctic Kelp Caves, either from fragments lying around or by scanning Sea Monkey Nests, which are small round hills covered in netting. Once you have its blueprint, you need to craft it; the recipe is 2 Diamonds, 1 Battery, 1 Titanium, and 1 Crystalline Sulfur. You should know where to find all of these materials except for Diamond, which can be found in the Thermal Spires surrounding the Rocket Island. Search the crevices around the island.

Once you have the Laser Cutter, begin exploring the biome southeast of the Rocket Island. It is mainly characterized by round rocks spewing purple or pink material, as well as flat blue seabeds and brownish-yellow terrain. This biome is called the Purple Vents. Within the Purple Vents is a large creature known as the Chelicerate, which may end up being the first leviathan creature you encounter. Leviathans are giant creatures which can be extremely dangerous to Robin, even while in vehicles. Fortunately, they are quite dumb and easy to avoid. Continue to explore the Purple Vents until you come a large shipwreck.

The salvage is inside of a massive Crashed Ship in the Purple Vents. It may behoove you to bring a Flashlight along, as the ship can be quite dark on the inside. If you have trouble finding the ship, try to stay along the border of the Purple Vents and a green-floored biome called the Lilypad Islands biome. Note that there are two halves of the Crashed Ship; if the half you find is not touching the Purple Vents biome (which has a yellow floor), it is the wrong half. Once you do find the correct location, you need to find a hole on the side of the ship to enter; there are several. Make sure to park your Seatruck near the entrance, and to bring a hefty tank, or even multiple (you can use multiple tanks if you switch them out in your inventory when at 30 seconds of oxygen). Be very careful where you go, as it is easy to get lost and drown inside the ship. You will have to cut open at least one sealed door with the Laser Cutter to find the salvage; go up to the door with your cutter out and hold right click to cut open a hole in the door. The salvage you need is within the engine room of the ship, inside a container that is also sealed shut. Once you have both salvages, head back to the radio tower with them in your inventory and repair the tower by holding the Repair Tool in your hand and hold right click. On the way up to the tower, you may encounter someone in a Prawn Suit. She'll become important later, so remember her.

Communications Returned
Once you repair the tower, Sam comes back over the radio and inform Robin that a meteor hit the Vesper and caused communications to fail. Robin's colleague Jeff was in the escape ship that took off at the beginning, and his ship appeared to have sailed off towards an on-land biome called the Glacial Basin. You will go there later, however at the moment Sam ends communications and you are most likely left without anything to do. More will come in an in-game day or two; you can use this opportunity to explore, find new technology, or build the next vehicle; the Prawn Suit.

Seatruck Upgrades
The next section requires bringing your Seatruck to depths under 200 meters; however, the Seatruck can't go any lower than that yet. To improve its crush depth, you must build the Seatruck Fabricator Module. Its fragments are located beneath the Twisty Bridges in a dark cave biome called the Deep Twisty Bridges. The entrance is located at the floor of the Twisty Bridges, near Sanctuary Zero. You can leave your Seatruck parked just above its crush depth and swim down to scan the fragments. Make sure to bring a form of light, and do your best to avoid the Squidsharks. While down there, you may also want to scan fragments for the Seatruck Storage Module, however you do not need them to progress.

Once you have the blueprint, you need to craft the Fabricator Module. All Seatruck modules are crafted at the Mobile Vehicle Bay, just like the Seatruck. Most of the ingredients shouldn't be new to you, except one. Plasteel Ingots introduces a new resource: Lithium. Combining it with Titanium Ingots creates an even stronger ingot. Lithium can be found in several biomes, but most easily they can be located in the Purple Vents biome from earlier. Once you've built the module, it'll drop into the water like the cabin. You can grab the handle on top of the module to drag it towards your Seatruck and attach it to the back, or use the Seatruck's rearview camera to back into the module. Make sure to attach the side with the handle to the back of the Seatruck.

Inside the Fabricator Module is a Fabricator. It can craft most of what a normal Fabricator can craft, except it can also craft Seatruck upgrades. by default, you get a few, any of which you can choose to craft, but the only one you need at the moment is the Seatruck Depth Upgrade MK1. This upgrade increases the Seatruck's crush depth to 350 meters. The recipe for it is quite simple (you can check it in the blueprints tab of your PDA). Once crafted, you can put the upgrade in the Seatruck by opening the hatch on the roof of the cabin.

Mining Site
That scary lady you saw was in a Prawn Suit; a vehicle that can walk along the seabed or above-water. It comes equipped with two modifiable arms and it very resilient to damage. Its blueprint can be found in two locations; the Glacial Basin and the Active Mining Site. The latter is slightly more dangerous, however it also contains an arm upgrade for the Prawn Suit, so you want to go there anyway. The entrance to the mining site is southwest of the Rocket Island, about 120 meters down in the Thermal Spires; it is not far from the island. You'll know you found the entrance when you find doors in the wall of the biome. This entrance, however, is too small for the Seatruck to fit through, and it is nearly impossible to get all the way through the mining site on oxygen alone, no matter how much equipment you bring along (save for a network of Pipes; it may work, but it'd be expensive). Rather, you want to bring the Seatruck through the secondary entrance; it is found a short distance from the main entrance. It's in a crevice filled with volcanic geysers. It may seem dangerous to put a Seatruck through a small hole filled with lava and explosions, but actually you can fit through pretty easily.

Once inside, you'll see a large hole in the ground with tracks going deeper, carrying large chunks of ore out of the cavern, though the site is no longer operational. Follow the tracks through the cavern to a platform holding a damaged Prawn Suit. This is a fragment you can scan; all four of the fragments are inside the cavern. By the first fragment is also a Prawn Suit Drill Arm fragment. You need two of these, and they are also inside the cave. A bit deeper within the cave you'll come across an area with the second drill arm fragment, which resembles some sort of loading dock for Prawn Suits. In this area there is a small console by one of the docks, next to which is a Prawn Suit Jump Jet Upgrade. You'll use it when you build your Prawn Suit. In this area is also a Data Box containing the Vehicle Upgrade Console, which is used to upgrade your vehicles. Make sure to pick it up before continuing, as well as scanning the two Prawn Suit fragments nearby.

A very short distance down the cave from the loading bay is a bend; the cavern splits into two parts. The left cave area contains a large Architect Artifact. They are not really needed to progress, but since you're in the area you should take the time to scan it. Artifacts can be found all over Sector Zero, and scanning enough of them will reward you with new technology.

The cave to the right is where the mining site ends. The elevator in the center of the room holds the blueprint for the Headlamp, a wearable Flashlight. Also in the room is the final Prawn Suit fragment. Collect it, and you should have everything you need from the mining site. You can exit from the same way you came in, or through a hole in the ceiling of the final room.

Prawn Suit
Now that you have unlocked the blueprint for the Prawn Suit and the Drill Arm, you can head back to your base or Drop Pod and craft them. The Prawn Suit is crafted in the Mobile Vehicle Bay, and requires 2 Plasteel Ingot, a Power Cell, 1 Enameled Glass, and 3 Lead, all of which you should know how to acquire. It can take a while to gather these resources, but it is rewarding. Once you build your Prawn Suit, it will sink to the bottom of the ocean, where you can enter it and start walking around on the ocean floor, with the same controls as you would use when walking on land. You can also control the left and right arms by clicking.

A Prawn Suit's arms is the core element of the vehicle. They can be modified to perform a large range of functions. In the mining site, you scanned the Prawn Suit Drill Arm, which can be used to mine large chunks of ore that you may have noticed in the mining site. To build the Drill Arm, you first need a Moonpool, which is attached to your base. Make sure to build the Moonpool somewhat close to the ground, so you can dock your Prawn Suit in it. Inside the Moonpool, you can build the Vehicle Upgrade Console (whose blueprint you picked up in the mining site) against one of the two smaller walls of the Moonpool. Once built, you can use the small fabricator on the wall by the console to craft the Drill Arm. The console also allows you to modify the name and color of any docked vehicles (you can also dock the Seatruck, and docked vehicles will recharge automatically). Make sure you have enough power in the base to run the upgrade console, as well as generate oxygen. See the Seabases page for power generation options. Both the upgrade console and the drill arm use familiar ingredients for their recipes. Once you have the drill arm, equip it onto your Prawn Suit with the upgrades panel on the side of the suit. It can also be accessed while undocked. Place the drill arm in one of the two middle slots, which represent your left and right arms. Then, you can use the drill arm by holding left or right mouse button. When looking at a large resource deposit, you will be able to drill resources directly into the Prawn Suit's inventory, which can be accessed from the back, on top of the suit just behind the hatch. Such deposits can be found in the mining site or later biomes.

Briefing
By now, Sam should have at some point come back over the radio and asked Robin to keep her informed about the Architect she heard in the research site, however Robin chooses not to reveal that she has since downloaded it into her brain. Sam sends Robin a briefing of the current situation in Sector Zero, showing three missions that can be completed. The first two missions both take place on land, so heading there first is recommended. The PDA should have picked up a signal from Jeff's escape ship and added it to Robin's beacon manager. If not, wait around until it does.

Entering the Basin
Head to the signal for the Glacial Basin; you will need to bring your Seatruck. The entrance is deep down, under a thick layer of ice. Once you get to the signal, you will have difficulties bringing your Seatruck through; fortunately, you do not need it in the Basin, so you can leave it there and navigate through the cave until you reach the surface. Once you surface, there should be a nearby dock you can use to climb onto the land. This area is the Glacial Basin, a freezing canyon in which speed is essential. Immediately make your way up the nearby hill by climbing the stairs, which will lead to the basin wall where the Snowfox Base is located. Enter the cave to heat up, as the temperature in this area is very dangerous. While here, you may want to scan the Spy Pengling remains, as they will become useful later.

In the Glacial Basin, temperature is your greatest enemy. Due to the strange weather conditions of Sector Zero, blizzards are very common and they can quickly result in Robin's death. Caves and water serve as safepoints, where you can wait out a blizzard. Beware as well of Snow Stalkers, bear-like predators that will attack Robin on sight.

Snowfox
Your first goal in the basin should be to build the Snowfox. It is a ground-only vehicle that can quickly hover across the Glacial Basin. Its fragments are all over the area; you need three. In the Snowfox Base, you can also find the Snowfox Hoverpad, which is where the Snowfox is built. If you have not brought resources to build these, don't worry; all of the ingredients for the hoverpad and the Snowfox can be found in the basin. Titanium can be acquired from limestone outcrops, and batteries and lubricant can be found in supply crates. Build the hoverpad somewhere in the basin with the Habitat Builder and then build the Snowfox on it.

The Snowfox controls about the same as other vehicles; to move, mouse to turn. also causes the Snowfox to boost forward. The Snowfox can also be picked up and redeployed if you click on the back of it, behind the seat.

Jeff's Bunker
The briefing mentioned the search & rescue mission for your colleague Jeff. His escape shuttle was abandoned in the Glacial Basin, meaning he must be in the canyon somewhere. In fact, he has a bunker in the area, hidden within a cave nearby. Searching for the bunker might take a while, but here are some hints: it is not past the large man-made bridge, and it is not in a wall of the canyon, but rather under one of the plateaus within. You will know you have found it when you find a door inside of a cave.

Inside the bunker is a PDA lying on a bed that shows Jeff attempting to find the Architect. In accordance with the PDA, Sam informs Robin that they will attempt to locate him to the west.

Leviathan Research
Your next step is also the next step in the briefing; acquiring genetic samples from a deceased leviathan research specimen. The leviathan is also located in the Glacial Basin; you must cross the large bridge to get to it. Find a way up onto the plateaus, cross the bridge, and following the path until you find a large cave entrance in the wall of the basin. Before entering the cave, head to the left and pick up the Snowfox Hop Module blueprint from the tech site nearby. Afterwards, head into the cave. Note that there are two different bridges. If the bridge you cross does not lead into a cave soon after (a cave, not a canyon), then you have crossed the wrong bridge.

As you head into the cave, the PDA will warn you that there is a leviathan nearby. When you get to the heart of the cave, you will see what it means. A Frozen Leviathan is encased in a large cube of ice, and Alterra has been experimenting on it. Pick up the Cold Suit blueprint; it is very useful for keeping warm. Explore the cave; you can go up to the next level of the area using an elevator. This is where the head of the leviathan is. Use the nearby console to turn on the sample extraction robot; it will pull a sample of Kharaa from the leviathan, which you can then pick up. Sam will come over the radio asking Robin to send it up in the Exchanger Rocket back at the Rocket Island. Before leaving the cave, you may want to pick up some Heat Fruits; they are purple fruits hanging from small trees that warm Robin up when she eats them. You can leave through either direction; both lead outside.

Kharaa Sample
Now, you need to send the sample up to Sam with the Exchanger Rocket at the Rocket Island. You can exit the Glacial Basin through the pool you used to enter it, and swim back down to your Seatruck, then to the Rocket Island. The Exchanger Rocket is by Radio Tower 7. You can open the cargo by stepping near it, and it opens up. Click on the cargo and place the Kharaa Sample inside, then head to the console at the nose of the rocket and press. The rocket then launches towards the Vesper. Sam confirms the payload but says nothing more.

Outpost Omega
As Sam has no further tasks for Robin, the next goal is to finish the last mission of the briefing. Despite being abandoned, Alterra still requires some data from Research Base Omega located in the Lilypad Islands. To get there, simply head back to where the Crashed Ship part was, then head towards the direction is it pointing (away from the island). You'll know you're there when you see floating chunks of earth suspended by large lilypads. Outpost Omega is within the most massive island in the center of the biome. Head to the top of the island and go down into it to find the base.

Once near the base, your PDA downloads the activation code for the doorway inside. Head into the base and input the code into the panel on the right of the door using left click. The research notes you need are on a circular blue table in the center of the room. Picking them up downloads the notes into your PDA, but Al-An warns Robin not to send them the notes or they may be in danger.

Al-An's Storage Medium
Al-An requires a new storage medium so that he may perform a wider range of functions than Robin's brain allows. In order to do that, Robin needs to collect certain parts, which are located in various Architect Caches around Sector Zero.

Preparation
The first cache is located in the Arctic Spires, an aboveground biome connected to the Glacial Basin. The Cold Suit you picked up earlier is very useful in the spires, however it requires a resource you don't yet have; Snow Stalker Fur. Hopefully, you scanned the Spy Pengling in the Snowfox Base while in the basin. If not, go back and scan it. The pengling is simple enough to build and doesn't require anything you haven't seen yet. You also need to build a Spy Pengling Remote to operate the pengling. Once you have built both, head back to the Glacial Basin and place down the Spy Pengling, then equip the remote and right click to activate it.

Spy Pengling controls are different than most vehicles, though simple enough. to move forward and backward, and to turn left and right. Left click to pick up with the pengling. Press to exit the pengling. Take care not to drive the Pengling into water or more than 50 meters away from Robin. To acquire Snow Stalker Fur, you must find a Snow Stalker and grab at it. You need 4 furs, but you can get all of them from a single Snow Stalker with ease. To take the furs from the Spy Pengling, simply go to it and open its storage with left click. Then head back to a fabricator and craft the Cold Suit (you also need some Fiber Mesh). Make sure to craft all three pieces, head, body and gloves for the full protection. The suit greatly helps to combat the effects of the cold.

It is also advised to increase the mobility of your Snowfox by crafting a Snowfox Hop Module in the Vehicle Upgrade Console, assuming you picked up the blueprint from the basin, near the Frozen Leviathan cave entrance. Add it to your Snowfox by opening the upgrades panel on the left side. Once you are ready to head into the Arctic Spires, head back to the Glacial Basin.

Through the Canyon
The entrance to the Arctic Spires is located on the opposite end of the basin from where the Snowfox Base is, on a high-up plateau connecting to the spires with a bridge (not the same bridge leading to the leviathan cave). You will want to ride your Snowfox into the spires. Not too far into the canyon you'll find a tech site with a large crane; this site contains the Thumper blueprint. It is in your best interest to go back home and craft multiple Thumpers.

If you did not meet one on the way to or from the tech site, then you have yet to encounter what is known as an Ice Worm. Ice Worm are land-based leviathans that burrow through the ground, listening for prey to ambush from below. Their aggressiveness and stealth make the Arctic Spires possibly the most dangerous biome in the Subnautica series. Even the sound of Robin running or the Snowfox moving will alert them to Robin's position, where they can very quickly and quietly kill Robin in few blows. In order to get through the canyon, you may need to employ the use of Thumpers, which create sound when placed and lure Ice Worms towards it while Robin makes a getaway.

Ice Worms are very versatile predators. They can dive out of the snow towards you, pop out of the snow under you, or burrow through the ground and make a short jump. They can attack from inside caves or even from the walls. Even the small tunnels located under the Arctic Spires are their hunting grounds; though not very damaging, their poke attacks are repetitive and can kill you. To get through the area, a combination of Thumpers and a large amount of First Aid Kits is recommended.

Arctic Spires Cache
The Arctic Spires Cache is nestled deep within the Arctic Spires, within a depression in the rocks. Its entrance is locked with a forcefield requiring a Purple Tablet to be opened, however only one of four required fragments is by the entrance. Other fragments are found in the canyon. Make sure to check up slopes and down crevices, and within caves. Broken Architect technology may signify a nearby fragment. After collecting all fragments you need to go back to a fabricator to craft the tablet. You will also need an Ion Cube for the recipe which you hopefully picked up from Sanctuary Zero. After that, head back to the cache and place the tablet on the forcefield control on the left to open the forcefield.

The Arctic Spires Cache is home to one Ion Cube, one Ion Cube Deposit and the skeleton for Al-An's Vessel. The Ion Cube Deposit is not as in the previous game fabricated at a factory, so this can be harvested once only. Once the skeleton has been scanned, you will get a blueprint Architect Skeleton, allowing you to collect materials in preparation for the vessel.

Preparation
Before going to the Deep Lilypads Cave Cache, you should ensure that you have food and water to survive one to two in-game days. This cache is 620 meters deep, so by now you should have the Seatruck Depth Upgrade MK3. Make sure you also have enough room in your inventory to pick up a few items. The cave houses a material that are needed in order to craft Al-An's Vessel which is the Flower Spore. You will need to pick up 15 Flower Spores, they will later be used to craft 3 Benzene and 3 Hydrochloric Acid.

Deep Lilypad Islands Cave
This cave is located just below the large suspended island where Research Base Omega is. The rock can be found if you follow the direction of the crashed ship that can be found on the border between The Purple Vents and Lilypad Islands biomes. Go in the direction that the crashed ship points to, the Squidsharks along the way should not pose a threat at this point.

Once you reach the suspended island go down the crevice around it until you reach the bottom. Once reached find the cave opening leading further down, and follow the alien structures until you reach the Deep Lilypads Cave Cache. Be sure not to go all the way inside your Seatruck, as it is possible to get it stuck inside the cache. Inside you will find the alien tissue needed for Al-An's Vessel, scanning this unlocks the Architect Tissues.

Preparation
As this is the last part in the process of creating Al-An's Vessel it is recommended that you bring along the items to craft all 3 parts. In total you will need: The Crystal Caves are home to several Shadow Leviathans, so make sure your gear is charged, or bring along spare Batteries and Power Cells. If you decide to bring you Seatruck with a few modules, it's a good idea to have the Horsepower Upgrade and/or the Afterburner Upgrade installed, as these will help you pass the danger quicker. These upgrades can be found in Sea Monkey Nests near the crashed ship. You can also choose to install the Perimeter Defense Upgrade, as this can shock predators, hopefully prevent Shadow Leviathan attacks.
 * 3 Plasteel Ingots
 * 3 Benzene
 * 3 Polyaniline
 * 1 Ion Cube

By this point you absolutely need the Seatruck Depth Upgrade MK3, since the last destination is just below 900 meters.

Get to Crystal Caves
There are a few entrances to the Crystal Caves, the safest and easiest is located in the Lilypad Islands biome and is fairly close to the large suspended island above the Deep Lilypads Cave. The entrance is connected to a small system of tunnels, which is also home to several Sea Monkey Nests. Located a site where 2 Squidsharks roam, and what looks like Precursor Technology. This area leads down to Marguerit Maida's Base. Her base has a Moonpool and a Large Room Glass Dome, which can be scanned for base building. If you have not been here yet, she will call you inside for a quick chat, you can go in through the Moonpool. When the chat is over you can pick up a Seatruck Perimeter Defense Upgrade behind you, and explore her base to scan a Toilet, Shower and Sink, which also can be use to decorate your own base. After this you can leave her base, and proceed deeper towards the Crystal Caves.

In the entrance to the Crystal Caves from Marguerit Maida's Base, several Prawn Suit Propulsion Cannon fragments can be found across the bottom.

Crystal Caves Cache
Once inside you can encounter the Shadow Leviathan, try to find an opening where the Leviathan circle the opposite site of the cave to avoid getting attacked. The Shadow Leviathans will circle around two crystal formation that leads down to the Crystal Caves Cache, where the Architect Organs can be found and scanned. There are two entrances, the Northern Crystal Castle Entrance, and the Southern Crystal Castle Entrance. It is hard to avoid getting attacked if you park your Seatruck down inside the crystal formation, however it is possible to fit down the hole if you only have a few modules attached. Your Seatruck can handle a few hits without getting destroyed and the Shadow Leviathans will ignore you for a bit after an attack.

You will have to leave your Seatruck behind for a bit while following a narrow path leading down to the cache. Once inside follow the road, and you will eventually reach the Architect Organs which unlocks the last piece of Al-An's Vessel after scanning.

Creating Al-An's Vessel
To craft Al-An's Vessel you need access the Fabricator Base found in the deepest part of Fabricator Caverns. It is located deeper inside the Crystal Caves and can be spotted by it's characteristic red colored crystals. There are two tunnels leading down, each with its' own Shadow Leviathan. Follow either one and try to find a space to park your Seatruck as you will have to leave it. The entrance to Fabricator Base is just below 900 meters, so you will have to swim the rest of the way.

Inside the base on the left side is 3 terminals. Each terminal is responsible for crafting one part of Al-An's Vessel. Input the materials into each terminal and start the fabrication process of the vessel.

After crafting the vessel, Al-An will tell you that you need a White Tablet to enter the Shield Facility. However the White Tablet is not currently in the game, the only way to get it is to spawn it, and even then the facility is just a placeholder.

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