Verified for the August 2026 patch · updated Aug 20, 2026
Sewer Branch
Best crate count of the green tier — a fuse, a switch, and a tunnel descent to a blue keycard.
At a glance
- Puzzle
- Green keycard
- Cards needed
- Fuses
- 1
- Rad protection
- None
- Recycler
- Yes, on-site
- Puzzle reward
- Blue keycard + 3+ crates
Sewer Branch is the green puzzle that pays best: more crates than Satellite Dish, two recyclers on-site, and the same one-card-one-fuse entry fee.
Why you’re here
The blue keycard and the best green-tier crate haul. The puzzle room at the bottom of the tunnels holds three or more crates plus the card — enough components and scrap to make the trip worth it even when the card desk is empty elsewhere.
The layout
Above ground it’s a scatter of warehouse buildings over a mine shaft; below, a branching sewer tunnel network. The puzzle starts in the red building up top (fuse + switch) and finishes down in the tunnels at the green card reader. There’s a recycler behind the red warehouse — and a second one underground behind a blue door for players who come back later with a blue card.
The full route with the circuit diagram: Sewer Branch puzzle guide.
Loot worth the trip
- Blue keycard in the puzzle loot room
- 3+ crates behind the green door
- Two recyclers — one behind the red warehouse, one underground