SpawnPass · Rust

Military Tunnels puzzle

All three keycards, a chain of timers, and the hardest scientists outside Oil Rig.

Last checked 2026-09-21

Overview

Military Tunnels is the full card chain — green, then blue, then red — run against a timer chain, underground, against scientists carrying shotguns at close range. The monument is worth it: elite crates in the red room and more in the train container that needs no card at all.

Enter through the portal

Go in by the main concrete ramp doors. There is a scientist on the overhead walkway above the entrance — take him before you go deeper.

Armory fuse and timer — 120 seconds

Take the first right into the Armory. Insert the fuse and flip the timer beside it: it powers both green doors for 120 seconds.

The green-door clock starts here.

Swipe green in Storage

The two green doors are at the far west end of the tunnels. Swipe green while the timer is running.

Flip the switch inside

Clear the room and flip the switch. This one switch powers both blue doors, the red-door timer and a second fuse box further in.

Swipe blue at the Laboratory

Move east through the main tunnels past the train carts and the red shipping container — its elite crates need no card and are usually contested. Swipe blue at the Laboratory door.

Timer, then red — 10 seconds

The red reader has its own timer beside it. Flip it and you have 10 seconds to swipe red. Expect shotgun scientists at very close range on the other side.

Ten seconds is not long. Stand at the reader with the card in hand before you flip the timer.

Optional: the second red door

A second fuse box sits beside the other blue door. A fuse there powers the lab switch, which opens the second red room — and gives the first red door a way in without the 10-second timer.

Loot and leave a different way

Elite and military crates in the red rooms. Exit by the wall buttons onto the spiral stairs, or back out through the mine past the recycler. Check the yard before you step into it.