Subnautica 2 Tadpole: What You Need to Build Your First Sub

The early hours of Subnautica 2 are spent mostly swimming, and that gets old fast. The Tadpole is the game's answer to that problem: a craftable submarine that dramatically opens up ocean exploration once players hit the mid-game. Getting there, though, takes a few steps that aren't immediately obvious.

Scanning the blueprints before anything else

The Tadpole can't be built from scratch. Players first need to find and scan one in the world. Companion character Noa eventually sends you to the Investigate Tadpole Pens signal after you collect enough black boxes during exploration, which makes this a natural mid-game milestone rather than something you stumble into.

Here's the thing: you can't fully explore the Tadpole Pens until you have the heat-survival adaptation unlocked. Without it, the abandoned base is inaccessible. Once you do have it, you'll need to scan three things inside: the Tadpole itself, the Tadpole Dock, and the Vehicle Fabricator. All three blueprints are required before any construction can begin.

The base requirements that catch players off guard

Building the Tadpole isn't just about materials. The vehicle needs a specific type of base infrastructure to dock and charge, and players who've been running lean bases will need to expand.

You'll need a moonpool with enough clearance underneath to house the Tadpole. The base itself needs at least four interconnected rooms, and the structure has to be elevated enough to give the submarine room to dock safely. Build too low and the whole base becomes unusable for this purpose.

Both the Tadpole Dock and the Vehicle Fabricator must be placed inside the moonpool. The dock determines which side of the moonpool the Tadpole enters from, and the fabricator is where you actually build the vehicle. Placing them side by side saves a lot of back-and-forth once you're ready to craft.

Material costs for all three components

The resource requirements are consistent across the dock and fabricator, then shift slightly for the vehicle itself.

Tadpole Dock:

• 2x Titanium Ingot
• 1x Copper Wire
• 1x Silver Ingot

Vehicle Fabricator:

• 2x Titanium Ingot
• 1x Copper Wire
• 1x Silver Ingot

Tadpole (built via Vehicle Fabricator):

• 2x Titanium Ingot
• 1x Glass
• 1x System Chip
• 1x Power Cell

A Processor in your base is needed to produce the ingots, so if you haven't built one yet, that's the prerequisite before any of this material gathering matters.

One major caveat once you're actually piloting it

The Tadpole is made primarily from glass. That's not just flavor text: the vehicle is genuinely fragile, and even minor collisions cause damage. Too much damage and it breaks completely, which can strand you far from any base with no obvious way back. Players diving into deeper biomes for materials like gold and lithium should treat the Tadpole carefully, not as an indestructible exploration tool.

For a full step-by-step breakdown of the scanning, base setup, and crafting process, the Subnautica 2 Tadpole guide covers every stage in detail. And if you're still working through the earlier survival systems before the Tadpole becomes accessible, the Subnautica 2 advanced survival tips are worth checking before you commit to a base location you might need to rebuild later.