Seabases are your main center of operations in Subnautica. They’re a series of buildings/facilities that the player builds through use of the Habitat Builder tool, and provide you with an area to return to for oxygen, energy and also serve as an alternative to Lifepod 5 as a home away from home. Just remember to be careful where you place your new home! The deeper the depth of your seabase, the greater the chance that your hull integrity will be compromised, and you then run the risk of developing hull breaches. But, fret not! Hull integrity can be improved through construction of reinforcement panels, building your seabase on a foundation, or installing bulkheads.
Want to spruce up the place to really make it feel like home? Seabases can be customized through installing lockers, fabricators, benches, aquariums, and more.
How to Build
Before you begin building your Subnautica getaway, you’re going to want to do some location scouting. Scour the land to find a suitable, flat piece of land. And if you can’t seem to find the right one, make one with the Terraformer. Another thing to remember is that placing a foundation will also flatten the lay of the land.
Once you’ve selected the ideal location for your new seabase, equip the Habitat Builder by clicking the RMB to open the crafting menu. Find and click into the Habitat Compartments tab, and whatever you’d like. Once you’ve selected a compartment, place the module in an appropriate building place as indicated by the green outline. You can adjust the rotation of the module by pressing Q or E, or by scrolling with the mouse wheel. Once you’re ready to place the module, press the LMB. After the module has been placed, hold LMB to finish the build. From there, you can continue to add new compartment modules via the crafting menu.
To deconstruct a Seabase module, equip the Habitat Builder and hold E while looking at the desired module. Once the module is removed, the materials used during construction will be returned to your inventory.