Subnautica Wiki
This article is about Seabases in Below Zero. Click here for information on this subject in Subnautica.

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 the Drop Pod as a base of operations. Within a seabase, the player can construct additional storage space, grow food, access appliances not available in the Drop Pod, and add aesthetic options. Thus Seabases provide safe havens away from the Shallow Twisty Bridges 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 and keep all the items in their inventory that they had when they were there (unless they later enter the Drop Pod).

The player will start out with most of the blueprints they need for a basic Seabase; at bare minimum one needs an I 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 cliff sides. The player can expand once they've gathered more Blueprints. 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, however.

Hull Integrity

Hull Integrity refers to the ability of the player's Seabase to withstand the pressure of the surrounding water. The majority of the modules will lower the integrity once added but the amount will vary by module. As Seabases are built at a greater depth the integrity reduction caused by each module will increase. Hull integrity can be increased by constructing Reinforcement panels, placing a Seabase on or near a Foundation (foundations built on top of rooms will still provide their benefit), or installing Bulkheads on the ends of Compartment modules.

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.

A Seabase that receives damage to its exterior (or even a knife hit from inside) will also spring leaks, but the hull integrity will be unaffected. Therefore, bulkheads are more effective at sealing off flooding if the base comes under attack.

Energy Usage

Energy can be provided to a Seabase by building various types of generators near or inside the Seabase. Any number or combination can be used. Appliances such as the Fabricator will drain energy from the Seabase.

There are currently four generators available to power Seabases:

Bioreactors and Nuclear Reactors are built inside a Multipurpose Room or Large Room. Solar Panels and Thermal Plants are built outside, and can be directly attached to the base or connected via Power Transmitters if the distance is too great.

Seabases do not require energy to operate in Creative Mode.

The following appliances and rooms draw power from the Seabase:


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.

How to Build a Seabase

  1. Find a suitable piece of land.
  2. Equip the Habitat Builder and press RMB 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 ].
  6. Place the module with LMB.
  7. Once placed, hold LMB to add the required materials to finish the building process.
  8. Go to Step 2 and repeat for each room you want to build.

To deconstruct a Seabase module, equip the Habitat Builder and hold Q 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 before the module itself can be deconstructed.

Base Parts

Base Pieces

Item Description Item ID
1x1 default bg.png
Foundation Icon.png
Reinforced habitat foundation. basefoundation
1x1 default bg.png
I Compartment Icon.png
I Compartment
Basic tubular compartment. basecorridori
1x1 default bg.png
L Compartment Icon.png
L Compartment
L-shaped compartment. basecorridorl
1x1 default bg.png
T Compartment Icon.png
T Compartment
T-shaped compartment. basecorridort
1x1 default bg.png
X Compartment Icon.png
X Compartment
X-shaped compartment. basecorridorx
1x1 default bg.png
I Glass Compartment Icon.png
I Glass Compartment
Basic glass-walled compartment. basecorridorglassi
1x1 default bg.png
L Glass Compartment Icon.png
L Glass Compartment
L-shaped glass compartment. basecorridorglassl
1x1 default bg.png
Vertical Connector Icon.png
Vertical Connector
Vertical base connector. baseconnector
1x1 default bg.png
Multipurpose Room Icon.png
Multipurpose Room
A basic room in which to install a range of different components. baseroom
1x1 default bg.png
Scanner Room Icon.png
Scanner Room
Locates resources and wrecks within range. basemaproom
1x1 default bg.png
Moonpool Icon.png
Vehicle docking bay. basemoonpool
1x1 default bg.png
Observatory Icon.png
Compartment with 360 degree views and low structural integrity. baseobservatory
1x1 default bg.png
Control Room Icon.png
Control Room
A control room. basecontrolroom
1x1 default bg.png
Large Room Icon.png
Large Room
A large room. baselargeroom
1x1 default bg.png
Multipurpose Room Glass Dome Icon.png
Multipurpose Room Glass Dome
A glass dome. baseglassdome
1x1 default bg.png
Large Room Glass Dome Icon.png
Large Room Glass Dome
A large glass dome. baselargeglassdome
1x1 default bg.png
Hatch Icon.png
Provides an access point to the habitat. basehatch
1x1 default bg.png
Window Icon.png
A port hole for your habitat, installed on an existing wall. basewindow
1x1 default bg.png
Reinforcement Icon.png
Increases hull integrity. basereinforcement

Exterior Modules

Item Description Item ID
1x1 default bg.png
Solar Panel Icon.png
Solar Panel
Powers habitat oxygen generation and other habitat modules. Converts available sunlight into low power electrical energy. solarpanel
1x1 default bg.png
Thermal Plant Icon.png
Thermal Plant
Converts heat to energy (> 15 °C) (50 power/min). thermalplant
1x1 default bg.png
Power Transmitter Icon.png
Power Transmitter
Extends range of power source. powertransmitter
1x1 default bg.png
Snowfox Hoverpad Icon.png
Snowfox Hoverpad
Deployable pad which recharges and repairs the Snowfox hoverbike. hoverpad
1x1 default bg.png
Floodlight Icon.png
Industrial, battery-powered lighting, designed for all environments. techlight
1x1 default bg.png
Spotlight Icon.png
Fixed lighting solution. spotlight
1x1 default bg.png
Exterior Growbed Icon.png
Exterior Growbed
Artificial plant bed, suitable for use on land or underwater. farmingtray
1x1 default bg.png
Base-attached Air Pump Icon.png
Base-attached Air Pump
Base-attached device that pumps air into pipes. Acts as a starting point for a pipe chain. basepipeconnector
1x1 default bg.png
Snowman Icon.png
A man made of snow. snowman

Interior Pieces

Item Description Item ID
1x1 default bg.png
Ladder Icon.png
Connects two floors. baseladder
1x1 default bg.png
Water Filtration Machine Icon.png
Water Filtration Machine
Separates water and salt. basefiltrationmachine
1x1 default bg.png
Bulkhead Icon.png
Structural support and can stop water flow (+2HP). basebulkhead
1x1 default bg.png
Bioreactor Icon.png
Composts organic matter into electrical energy. basebioreactor
1x1 default bg.png
Nuclear Reactor Icon.png
Nuclear Reactor
Processes nuclear reactor rods. basenuclearreactor
1x1 default bg.png
Alien Containment Icon.png
Alien Containment
Provides optimal conditions for flora and fauna. Add a hatch to enter. basewaterpark
1x1 default bg.png
Large Room Partition Icon.png
Large Room Partition
A room partition. basepartition
1x1 default bg.png
Large Room Partition Door Icon.png
Large Room Partition Door
A room partition door. basepartitiondoor

Interior Modules

Item Description Item ID
1x1 default bg.png
Fabricator Icon.png
Basic survival fabricator. Atomically rearranges raw resources into useful objects. fabricator
1x1 default bg.png
Radio Icon.png
Receive short-range communications. radio
1x1 default bg.png
Wall Locker Icon.png
Wall Locker
Wall-mounted storage locker. smalllocker
1x1 default bg.png
Locker Icon.png
Locks away things you need to store. locker
1x1 default bg.png
Battery Charger Icon.png
Battery Charger
Can charge up to 4 batteries simultaneously. batterycharger
1x1 default bg.png
Power Cell Charger Icon.png
Power Cell Charger
Can charge up to 2 power cells simultaneously. powercellcharger
1x1 default bg.png
Aquarium Icon.png
Self-sustaining aquatic habitat. aquarium
1x1 default bg.png
Modification Station Icon.png
Modification Station
Advanced fabricator for modification of survival equipment. workbench
1x1 default bg.png
Jukebox Icon.png
Listen to soothing tunes by Alterra's best musical artists while you work. jukebox
1x1 default bg.png
Jukebox Speaker Icon.png
Jukebox Speaker
A device that generates sound waves. speaker
1x1 default bg.png
Basic Plant Pot Icon.png
Basic Plant Pot
Titanium pot containing synthetic soil. planterpot
1x1 default bg.png
Composite Plant Pot Icon.png
Composite Plant Pot
Designed titanium pot containing synthetic soil. planterpot2
1x1 default bg.png
Chic Plant Pot Icon.png
Chic Plant Pot
Upmarket titanium pot containing synthetic soil. planterpot3
1x1 default bg.png
Indoor Growbed Icon.png
Indoor Growbed
Artificial plant bed, suitable for interior use only. planterbox
1x1 default bg.png
Plant Shelf Icon.png
Plant Shelf
Wall-mounted plant pot. plantershelf

Miscellaneous Items

Item Description Item ID
1x1 default bg.png
Bench Icon.png
Simple metal relaxation appliance. Conserves energy when resting. bench
1x1 default bg.png
Basic Double Bed Icon.png
Basic Double Bed
A double bed. bed1
1x1 default bg.png
Quilted Double Bed Icon.png
Quilted Double Bed
A double bed with a beautiful gray linen spread. bed2
1x1 default bg.png
Single Bed Icon.png
Single Bed
A single bed. narrowbed
1x1 default bg.png
Desk Icon.png
Common starship work desk. starshipdesk
1x1 default bg.png
Executive Desk Icon.png
Executive Desk
Executive work desk. executivedesk
1x1 default bg.png
Swivel Chair Icon.png
Swivel Chair
Turns 360 degrees. starshipchair
1x1 default bg.png
Office Chair Icon.png
Office Chair
Relaxing and confidence building. starshipchair2
1x1 default bg.png
Command Chair Icon.png
Command Chair
Commandeering. starshipchair3
1x1 default bg.png
Sign Icon.png
Sign post with configurable text. sign
1x1 default bg.png
Picture Frame Icon.png
Picture Frame
Wall-mounted frame, upload desired image from compatible PDA photo galleries. pictureframe
1x1 default bg.png
Bar Table Icon.png
Bar Table
Round glass table. bartable
1x1 default bg.png
Trash Can Icon.png
Trash Can
Trash cans. trashcans
1x1 default bg.png
Nuclear Waste Disposal Icon.png
Nuclear Waste Disposal
Used to dispose of nuclear waste. labtrashcan
1x1 default bg.png
Vending Machine Icon.png
Vending Machine
Vending machine. vendingmachine
1x1 default bg.png
Coffee Vending Machine Icon.png
Coffee Vending Machine
Synthesizes hydrating, caffeine-free coffee. coffeevendingmachine
1x1 default bg.png
Counter Icon.png
Counter. labcounter
1x1 default bg.png
Fridge Icon.png
Keeps food cold and prevents it from spoiling. fridge
1x1 default bg.png
Shower Icon.png
Emits high-intensity water streams. Soap not included. shower
1x1 default bg.png
Sink Icon.png
A place to do the dishes. sink
1x1 default bg.png
Small Stove Icon.png
Small Stove
Low-power conduction unit. Useless. smallstove
1x1 default bg.png
Toilet Icon.png
Alternatively, you could just go to the ocean. toilet
1x1 default bg.png
Wall Planter Icon.png
Wall Planter
Wall-mounted foliage. Purely decorational. baseplanter
1x1 default bg.png
Single Wall Shelf Icon.png
Single Wall Shelf
Single wall shelf. singlewallshelf
1x1 default bg.png
Wall Shelves Icon.png
Wall Shelves
Wall shelves. wallshelves