Subnautica 2 ditches the floating Mobile Vehicle Bay of the earlier games and folds vehicle construction into the Moonpool. The Vehicle Fabricator lives inside that base module, and you cannot print a submersible like the Tadpole without one. Everything else — fragments, materials, power — flows toward that single dock.
What the vehicle bay is in Subnautica 2
The vehicle bay in Subnautica 2 is not a deployable raft you toss into open water. It is a fixed station built into the Moonpool, which doubles as the dock, repair point, and fabrication hub for submersibles. Place the Moonpool and the Vehicle Fabricator inside it, which becomes the interface you use to print a vehicle once the blueprint and materials are ready.
Because the bay is tied to the Moonpool, vehicle progression now depends on base building rather than a single inventory item. No Moonpool, no vehicles.
Requirements before the fabricator works
Three things have to line up: a functioning base with the Moonpool attached, an unlocked vehicle blueprint, and the raw materials in your inventory. Miss any one, and the fabricator either stays locked or refuses to start the build.
| Requirement | Detail |
|---|---|
| Scanner | Needed to scan vehicle fragments and unlock blueprints from wrecks. |
| Habitat Builder | Two Habitat Builders must be scanned before you can place corridors and rooms. |
| Base power | Solar Panels for shallow setups; Bioreactors for deeper or larger bases. |
| Moonpool | Holds the Vehicle Fabricator. Requires open vertical clearance below it to dock vehicles. |
| Vehicle blueprint | Three fragments scanned per vehicle, including the Tadpole. |
How to unlock the Tadpole, your first vehicle
The Tadpole is the entry-level submersible in Subnautica 2 and the first vehicle most players will print. It cannot be crafted from a menu directly. You have to scan its fragments out in the world before the Moonpool's fabricator recognises the recipe.
Step 1: Build a Scanner using basic materials gathered from the seabed. The Scanner is what converts wreck debris and alien tech into usable blueprints.
Step 2: Search canyon systems, wreck sites, and the transitional zones between the Safe Shallows and mid-depth biomes. Tadpole fragments tend to cluster around those areas.
Step 3: Scan three Tadpole fragments. Once the third scan completes, the blueprint registers inside the Moonpool's Vehicle Fabricator.
Building the Moonpool
The Moonpool is the room that hosts the vehicle bay. Scan its fragments across wreck zones, then craft it with Titanium using the Habitat Builder. Placement matters more than the recipe.
Drop the Moonpool somewhere with open water directly underneath. If the seabed sits too close, or if another base part blocks the underside, vehicles will not dock, and the fabricator will not deploy them. Give it vertical room before you commit.
Crafting a vehicle at the fabricator
Once the Moonpool is live and the Tadpole blueprint is unlocked, walk up to the Vehicle Fabricator inside the room. The interface lists every vehicle you have blueprints for and shows the materials still missing.
The Tadpole specifically asks for Titanium Ingots, Glass, a System Chip, and a Power Cell. Titanium Ingots come from processing raw Titanium. Glass is refined Quartz. The System Chip leans on Silver, Gold, and electronics components that push you into deeper caves. The Power Cell mixes biological and mineral inputs, which means a trip through hazardous biomes for the rare materials.
With everything loaded, confirm the build. The fabricator assembles the vehicle and drops it into the water beneath the Moonpool, ready to board.
How to confirm the build worked
The Tadpole appears docked underneath the Moonpool with full power and hull integrity. You can board it directly from the dock, and the Vehicle Fabricator's recipe entry shifts to show the vehicle as constructed. If the materials disappeared from your inventory but no vehicle spawned, the most common cause is insufficient clearance below the Moonpool — relocate the room and try again.
Why the bay design changed
The original Subnautica and Below Zero used the Mobile Vehicle Bay, a deployable that floated to the surface, unfolded, and used printer drones to assemble Seamoths, Prawn Suits, Cyclops hulls, or Seatruck modules. It took nine inventory slots and could be picked back up by interacting with its platform.
Subnautica 2 replaces that portable workflow with a fixed Moonpool-based fabricator. The trade-off is straightforward: you lose the ability to build a Prawn Suit on the spot deep inside a cave system, but you gain a permanent dock, repair point, and upgrade station in one structure. Vehicle progression now rewards base planning rather than carrying a printer in your backpack.
Upgrading after the first build
The base Tadpole handles early exploration but stalls at deeper pressure zones. Depth modules extend its safe operating range, efficiency upgrades stretch power consumption on longer trips, and structural enhancements raise survivability against late-game predators. All of those modules are applied through the Moonpool, which keeps the vehicle bay relevant well past the initial unlock.