Subnautica 2 Tadpole Pens Guide — How to Open the Locked Door

What You Need Before Visiting

Tadpole Pens — deep in Graveyards biome

Heat Tolerance Adaptation is required. Without it, ambient temperature will kill you.

How to Reach

~680m east of Lifepod, ~150m depth. Head east past coral gardens into graveyards.

How to Enter

Door requires keycode from Zip’s Blackbox

Press the button → scan turns red → keycode required.

How to Get the Keycode

Step 1: Go to Tailings Village

~210m southwest of Tadpole Pens

Step 2: Drop into Hot Caves

Drop through holes in Tailings Village

Step 3: Find the Central Vent

Massive chamber with thermal vent

Step 4: Descend to Angel Comb Root

Look for Angel Comb root at lowest point

Step 5: Interact with Zip’s Blackbox

Adds Kurul Level Access Code to Databank

Opening the Door

Scan turns green, door opens

First room has Repair Tool fragment and alien ornaments.

Scan the Repair Tool fragment

Boot up NOA Terminal for next objective

All Items in Tadpole Pens

Item	Location
Tadpole Fragments x3	Cargo docks, first room, backroom Moonpool
Hydroelectric Turbine Fragment	Outside pens
Halfround Room Data Card	Lounge table
Moonpool Data Card	Backroom near parked Tadpole
Scout Ray Chassis Fragment	Backroom
Power Cell Terminal Fragment	Backroom wall

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The Bottom Line: The Tadpole isn’t just a vehicle — it’s your lifeline. I spent my first few hours treating it like a nice-to-have and wondering why I kept dying in deep water. Then I built one, upgraded it, and suddenly the ocean opened up. Prioritize the Depth Module. Get the Scout Chassis before you cross to the Alien Ruins. A well-equipped Tadpole is the difference between exploring and just barely surviving.