Is Sewer Branch worth doing?

Yes — it's one of the best green-card puzzles: ~9 crates plus a blue card, low risk, mild radiation.

What keycard does Sewer Branch need?

A Green keycard and one electric fuse; it rewards a Blue keycard.

🚇 Rust · Green-Card Puzzle

The most crate-dense green puzzle, and very solo-friendly — no scientists, easy route. A must-visit for an early blue card.

Current as of the October 2025 'Meta Shift' update · cross-checked vs. rusthelp + Rustafied (June 2026)

🎒

Keycards	Green
Fuses	1 electric fuse — looted only, bring a spare
Radiation	Mild — a basic burlap set is enough; no rad suit needed.

🧩

From the parking-area entrance, go into the large red building near the lot (its door may be boarded on a fresh wipe — break it).

Insert your fuse into the fuse box behind the electrical panels inside.

Flip the switch immediately to the left of the fuse box to power the puzzle.

Follow the wiring to either of the two tunnel entrances and head underground.

Follow the tunnel to the Green card door and swipe.

Loot the room with the single overhead spotlight — the Blue keycard is on the desk.

📷 Screenshots coming for these spots:

📷Screenshot to add: The red building entrance off the parking lot

📷Screenshot to add: The fuse box + the switch to its left

📷Screenshot to add: The underground green door + the Blue card on the desk

💰

Keycard-door loot respawns every 30 minutes — far faster than open crates, so a puzzle you can reach is renewable income.

There's an oil refinery and a recycler near the parking lot — handy for processing on the spot.

Loot was bumped up in the Oct 2025 update; expect more crates than older guides show.