GREEN TIER
Verified for the August 2026 patch · updated Aug 20, 2026
Harbor (Small) Puzzle Guide — Green Card Route
Small Harbor needs a green keycard and 1 electric fuse. Reward: a blue keycard. Flip the exterior switch, fuse the building, then hit the hangar's back-right green door.
Difficulty: easy · time on-site: 3–5 min · by RustLogic Staff
Bring exactly this
- Green card ×1
- Electric fuse ×1
The small Harbor circuit runs backwards compared to most greens — the switch is outside. Learn the order once and this becomes your fastest blue card on coastal maps.
Before you go
Green keycard + one electric fuse. No rads, no NPCs.
The route
- Flip the exterior switch first. It’s on the outside of a building in the yard — arm the circuit before you go interior.
- Fuse the building. Head inside and place your fuse in the fuse box. With switch + fuse both done, the hangar reader is live.
- Hangar, back-right. Enter the main hangar and move to the back-right corner — the green reader sits on the door there.
- Swipe and loot. Inside: a crate and the blue keycard.
After the run
Hit the recycler with your dock components, then plan the blue spend: Water Treatment or Train Yard each turn that blue card into a red one for a single fuse.
Harbor (Small) — quick answers
- What do I need for the small Harbor puzzle?
- A green keycard and one electric fuse. No radiation protection required.
- Where is the green door at small Harbor?
- At the back-right of the main hangar. Power it via the exterior switch and the fuse box inside the adjacent building first.
- Small Harbor or large Harbor — which is faster?
- Small Harbor is usually the faster card run; large Harbor has more loot and the Cargo Ship dock. Same requirements and same blue-card reward either way.