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Find Zip’s black box and open the Tadpole Pens

Quick answer

Get Heat Tolerance before travelling to the Tadpole Pens. The door code is recovered from Zip’s black box in the Hot Caves.

By · Updated

How this guide was checked

Coverage: Early Access 1.2 · Buddy System Hotfix 2 (October 6) · official sources checked October 23, 2026 UTC · older routes retain their source/build limits. Research checked 8 Oct 2026. Updated 25 Oct 2026

This guide uses the linked sources and any attributed demonstrations. Platform differences and limitations are noted with the advice they affect.

See the 1 sources
1 sources
Creator clipChecked on screen · 25 Oct 20262 steps1 moment · 0:09
  1. Spoiler2:50–2:59Reach the codeTap to reveal · TroubleChute Basics

Open marked sections to reveal solutions or story details.

Before you start

  • Heat Tolerance, improved oxygen and charged tools.
  • Bring food, water and healing; this is a longer trip than the early black boxes.
1

Prepare for NOA’s objective

The Pens signal is roughly 675 m east of the Lifepod. The published walkthrough received it after the other early black boxes. Follow the objective in your save rather than assuming an exact timer.

An underwater canyon with steep walls.

A deeper underwater environment. The image does not identify the location of a particular blueprint.

Unknown Worlds / KRAFTON · Source ↗ · Enlarge ↗

Sources for this section
2

Reach the code

  1. From the Pens, head south at about 195° through the ravine beneath the lava pipes.
  2. Enter the ground-level cave and take the glowing blue tunnel southwest.
  3. In the chamber with the central lava vent, descend toward the small opening on its right.
  4. Leave the Tadpole before exceeding its depth rating; swim the final section only with sufficient oxygen.
  5. Find the human hologram above the purple growth and recover Zip’s black box. Return to unlock the Pens.
    Spoiler clip · Finding Zip's black box on the purple growth · reveal

    Older footage · checked Oct 25, 2026 · before Subnautica 2 Early Access 1.2 (Buddy System, August 19, 2026)

    2:50–2:59 · 9 sFinding Zip's black box on the purple growth

    On screen: At about 300 m the diver swims over a mass of dark purple growth under a cave wall and, at 306 m, reaches a small orange-and-grey black box lying on it with a label naming Zip.

    Check the guide’s version notes before following older footage.

    TroubleChute BasicsFull video ↗
    Credits

    “Tadpole Pens Door (Access Code Guide) | How to Unlock | Subnautica 2 Guide” by TroubleChute Basics · May 19, 2026 · Early Access launch window (uploaded 2026-05-19); predates the Adaptive Measures and Buddy System updates

    Independent creator · no partnership implied

    Creator? Ask us to remove this

    2:50–2:59Spoiler clip
Sources for this section

Related guides

Celestine, Atacamite and Troilite: routes from the Alien Ruins

Clear Angel Combs for Heat Tolerance and Axum Vision

Oxygen upgrades: tanks, Air Bladders and the Rebreather

Build your first Tadpole and keep it running

Collect Lithium for oxygen gear and Plasteel

You’re ready when…

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Sources · 1Walkthrough · checked 12 Sep 2026 · Research checked 8 Oct 2026
Tadpole Pens and Zip ↗Door-code route and depth caution.Walkthrough ·

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