Modular Seabed
Habitats
Subnautica 2 rebuilds construction for co-op. Four divers share one home on the seabed. Every corridor, every rule, every placement detail Unknown Worlds has shown on record.
6
Module Categories
4
Fully Revealed
2
Teased / Hinted
4
Co-op Cap
System · Overview
Base building at a glance
Confirmed details pulled from the Building Bases dev log and Unknown Worlds Q&A appearances.
System
Fully redesigned modular builder, not a copy of Subnautica 1
Shared construction
Any crew member can place parts, not just the host
Decoration
Deeper decoration layer with placement rules being shown off
Hull integrity
Depth, pressure and oxygen still matter for every room
Power
Modular power sources hinted at in the Building Bases vlog
Docking
Tadpole and future vehicles dock directly into base modules
Modules · 6 Categories
Every part grouped by function
What Unknown Worlds has shown, teased or carried over. No guesses.
Category
Core rooms
- 01Corridors
- 02Multipurpose rooms
- 03Observation rooms
▸ The foundation set shown in the Building Bases dev vlog (Mar 12, 2026).
Category
Utility
- 01Hatches
- 02Water locks
- 03Reinforcement pieces
▸ Pressure and structural parts confirmed on camera in the same dev log.
Category
Crafting & fabrication
- 01Fabricator
- 02Modification station
- 03Charging stations
▸ Carried forward in spirit from Subnautica 1. Specific versions not yet shown.
Category
Power & life support
- 01Solar / bio / thermal generators
- 02Battery banks
- 03Oxygen plants
▸ Hinted at in Q&A but not fully revealed on camera.
Category
Decoration
- 01Posters
- 02Plants
- 03Lighting sets
- 04Seats and tables
▸ Dev log shows the expanded decoration layer with free placement.
Category
Co-op specific
- 01Shared storage
- 02Multi-seat consoles
- 03Bunk modules
▸ Built so four divers can share one underwater home without fighting over space.
Co-op · Rules
What changes with four divers
Shared construction doesn't break the engineering puzzle. It just multiplies the hands on it.
Any crew can build
The host does not own construction. Every co-op player can place corridors, rooms and decoration using shared resources from the base storage.
Shared storage by default
Base lockers pool crew resources. Drop in after a dive and everything is available to pick up mid-build.
Structural rules still apply
Depth pressure and integrity still matter. Co-op does not remove the engineering puzzle, it just gives you four sets of hands on it.
Placement is free but physical
Dev vlogs show parts snapping and previewing in real time. If a piece conflicts, the game blocks placement instead of clipping it through the hull.
Source · Dev Vlog
Building Bases walkthrough
Official footage of every module and rule referenced above.
Subnautica 2 Dev Vlog - Building Bases
In our sixth Subnautica 2 Dev Vlog, the team returns to showcase the all-new base-building system.
Watch the full breakdown
