This article is about Seabases in Subnautica. To see this subject's article on the Below Zero Wiki, click here.
This article is about the Seabases. You may be looking for the Degasi Seabases.

Seabases are installations created by the player through the use of the Habitat Builder.

A Seabase provides an area where the Player can return for oxygen, and serves as an alternative to Lifepod 5 as a base of operations. Within a seabase, the player can construct additional storage space, grow food, access Appliances not available in Lifepod 5, and add aesthetic options. Thus Seabases provide safe havens away from the Safe Shallows the player starts in.

In all Game Modes except Creative Mode, entering a Seabase secures the player's inventory, so if the player dies, they will return to the last Seabase they visited (Lifepod 5 and a Cyclops also count as Seabases for this purpose) and keep all the items in their inventory that they had when they were there. This occurs even if they die while inside the base in question: thus, quickly building a single Basic Compartment and a Hatch on the seabed can be a valid tactic to secure the player's inventory if they are about to die.

The player will start out with most of the blueprints they need for a basic Seabase; at bare minimum one needs a Compartment, a Hatch, and a power generator (the Solar Panel is unlocked by default). The initial compartment must be built on or near the ground (or on a Foundation, which is not necessary but provides greater hull integrity and a flat surface to work with), but any additional compartments can overhang without any issue, allowing bases to be built over cliffsides. The player can acquire Blueprints which allow additional module types to be created.

Spoiler alert: The following section contains story related material.

Degasi Seabases can be found at the center and on the tops of the mountains of the Floating Island, Jellyshroom Cave, and Deep Grand Reef. These abandoned Seabases provide blueprints for additional base components that the player doesn't have access to by default, such as the Multipurpose Room and the Observatory. Other base components, power generators, appliances and furniture, can be found in Wrecks.

Despite their name, Seabases can be built on land. When on land, Hull Integrity is not a factor, and can be built without the need of additional Reinforcements, Foundations, or Bulkheads. Power is still needed for them to operate but any segment of a seabase that is above sea level does not need power to give you oxygen.

Hull Integrity

Seabase interior

Hull Integrity refers to the ability of the player's Seabase to withstand the pressure of the surrounding water. The majority of the modules lower the hull integrity. At greater depths the integrity reduction caused by each module increases.

When the hull integrity of a Seabase is less than or equal to zero, it will begin to form hull breaches. Any corridor or room that is connected to the breach will begin flooding with water. Bulkheads can compartmentalize the base and prevent floodwaters from moving between compartments, but if the integrity remains below zero then eventually every compartment will develop a leak and the base will fill completely with water. To avoid this, quickly increase the base's integrity (by either adding strengthening components or removing weak components) and fix all hull breaches in the base using a Repair Tool.

Seabase modules use a multiplier system on negative hull integrity penalties instead of having a specific crush depth, and are not affected by high local temperatures.

A Seabase that receives damage to its exterior will also spring leaks, but the hull integrity will be unaffected. For the most part, only the player can damage a Seabase, typically through vehicle collisions: otherwise, aggressive Fauna will ignore one, though predators may be seen trying to attack prey species through the walls of a module containing an Alien Containment tank. Exceptions to this are Crashfish which can damage the base when they explode, and Tiger Plants placed in an Exterior Growbed, which can damage the base with missed shots.

Seabase modules built above water do not use the hull integrity system. If a base is partially above water, the components that are above will neither add to or subtract from the hull integrity of the base overall.


Energy is a resource that needs to be managed for bases, much like Food, Water and Oxygen need to be for the player. All seabases, no matter what module, have a default of 0 power capacity. Different types of generator have different energy capacity. Bases that isn’t connected in any way handle their energy demands and generation individually.

Energy Production

Energy is produced by energy generators, all buildable by the player through the use of the Habitat Builder. There are four different types, two can only be built inside a Multipurpose Room, and the other two must be placed externally. These last two can be located further away from the habitable parts of the seabase if the player rigs up Power Transmitters to bridge the gap.

Each energy generator comes with its own energy storage capacity and its own energy generation rate.

Built inside a Multipurpose Room:

  • Bioreactors (capacity 500E, rate 50E/min) convert organic matter into a certain amount of energy at a set rate. Rate does not change with object.
  • Nuclear Reactors (capacity 2500E, rate 250E/min) convert Reactor Rods into a certain amount of energy at a set rate

Built on their own:

  • Solar Panels (capacity 75E, the rate varies) convert light to energy during daylight hours at a variable rate affected by depth
  • Thermal Plants (capacity 250E, the rate varies) convert heat energy (build near Lava Geysers and Black Smokers) at a variable rate affected by local water temperature

Energy Usage

Each appliance consumes a certain amount of energy for a task and it does this at a certain energy consumption rate. The energy requirement may be either continuous or only when a device is being used, depending on the type of device: for example, a Fabricator only uses energy while it is creating something, while a Floodlight uses energy constantly.

If energy is not being used, Bioreactors and Nuclear Reactors will not consume resources.

The following Appliances draw power from the Seabase:

Seabases do not require energy to operate in Creative Mode. A notable exception to this is the ability to dock a Seamoth in a Moonpool, which does require power.

Energy transfer

Power Transmitters are used to transfer energy. They come with some caveats. Most obviously, they can only transmit power from a generator to a base, not from a base to a distant power-demanding structure.


Seabases automatically produce Oxygen as long as there is power supplied. If the power is depleted, the Seabase will slowly lose oxygen, until it is completely gone.

Oxygen is always available in any portion of a seabase that is above water, regardless of power.

How to Build a Seabase

  1. Find a suitable piece of land.
  2. Equip the Habitat Builder and press RMB (Xbox One:XBOX Right Trigger, PlayStation 4:PS4 R2) to bring up a crafting menu.
  3. In the Habitat Compartments tab, select the desired module.
  4. Aim at the desired building place (the outline of the module will become green if the location is valid).
  5. Adjust the rotation with Mousewheel Up and Mousewheel Down or [ and ] (Xbox One and PlayStation 4:PS4 Dpad LeftPS4 Dpad Right). Please keep in mind, you cannot rotate the moonpool once another module has been placed.
  6. Place the module with LMB (Xbox One:XBOX A, PlayStation 4:Combops4x).
  7. Once placed, hold LMB (Xbox One:XBOX A, PlayStation 4:Combops4x) to add the required materials to finish the building process.
  8. Go to Step 2 and repeat for each room you want to build. Remember that once the desired module has been placed other modules that are placed near it will snap to its position, making it easier to build.

To deconstruct a Seabase module, equip the Habitat Builder and hold Q (Xbox One and PlayStation 4:PS4 Dpad Down) while facing the module. If enough inventory space is available, the module will be deconstructed and all materials used to create the module will be returned to the player's inventory, one item at a time. Note that everything inside the module and attached to the outside of the module must be deconstructed (This excludes other Seabase modules, they do not need to be deconstructed in order to remove a part.) before the module itself can be deconstructed.


The Seabase's AI plays various messages that correspond to different circumstances, some accompanied by sound cues:

Trigger Dialogue
Log-128 When Seabase is repaired "Hull integrity restored. Draining systems initiated."
Log-128 When the Seabase has no power "Warning: Emergency power only. Oxygen production offline."
Log-128 Restoring Seabase's power "Power restored. All primary systems online."
Log-128 Entering Seabase or Seamoth "Welcome aboard captain."

Available Modules

Modules Description Hull Integrity
Provides structural support and prevents flooding. +3.0 Units
Basic Compartment
Basic Compartment
Basic tubular compartment. -1.0 Unit
Glass Compartment
Glass Compartment
Basic glass-walled compartment. -2.0 Units
L Compartment
L Compartment
L-shaped compartment. -1.0 Unit
L Glass Compartment
L Glass Compartment
L-shaped glass compartment. -2.0 Units
T Compartment
T Compartment
T-shaped compartment. -1.0 Unit
X Compartment
X Compartment
X-shaped compartment. -1.0 Unit
Reinforced habitat foundation. +2.0 Units
Provides an access point to the habitat. -1.0 Unit
Moon Pool
Vehicle docking bay. -5.0 Units
Multipurpose Room
Multipurpose Room
Basic room. -1.25 Units
Compartment with 360-degree views and low structural integrity. -3.0 Units
Increases hull strength. +7.0 Units
Scanner Room
Scanner Room
Locates resources and wrecks within range. -1 Units
Vertical Connector
Vertical Connector
Vertical base connector. -0.5 Units
Observatory window. -1.0 Unit
  • Note that negative changes to hull integrity increase with depth. For more information see Hull Integrity.

External modules

For complete list see exterior modules.

Interior modules

For complete list see interior modules.

Interior pieces

For complete list see interior pieces.


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