Verified for the August 2026 patch · updated Aug 20, 2026
Underwater Labs
Procedurally-built sea-floor stations with their own green, blue, and red modules — bring a sub and spare fuses.
At a glance
- Puzzle
- Red keycard
- Cards needed
- Fuses
- 2
- Rad protection
- None — bring diving/sub logistics instead
- Recycler
- No
- Puzzle reward
- Module loot rooms scale with card tier
Underwater Labs move the card chain to the sea floor — modular stations assembled differently on every map, so no two labs run exactly alike. The cards work the same; the floor plan is yours to scout.
Why you’re here
Elite crates without the surface-monument crowds. A full lab chain can clear 500–2,000 scrap, and the trip filters out casual competition: you need a submarine (or serious diving logistics) just to knock on the door.
The layout
Each lab is assembled from modules — and the keycard rooms come in green, blue, and red flavors whose exact mix varies per station. Typical patterns verified this patch: a blue module route that wants a green card + blue card + 1 fuse, and red modules wanting a red card with 1–2 fuses (one common variant: blue + red cards + 2 fuses for a triple-elite room). Scientists patrol the corridors; the tight sightlines favor shotguns and SMGs.
Route logic and module patterns: Underwater Labs guide.
Loot worth the trip
- Red modules: up to 3 elite crates + large crates per module
- Blue modules: military crates and lab loot
- 500–2,000 scrap potential across a full station chain