special
Train Tunnel Network
Underground stations — NVG, elite loot in some rooms
Overview
- TypeUnderground network
- KeycardNo tier 3 puzzle
- NVGRecommended
- LootVaries by station
- Elite cratesSome stations
The Train Tunnel Network connects underground stations beneath the map with rail tunnels, loot rooms, and occasional elite crates. Some sections require night vision goggles and feel closer to tier 2–3 dungeon runs than surface monuments.
There is no red puzzle at network scale, but individual stations vary in scientist presence and radiation.