There is an intricate network of cave tunnels below, above and all around the Underrail metro system.
|Major location information|
|Located in||Around Lower Underrail|
|Connections||Lower Underrail (multiple exits) |
GMS compound level 1
Hanging Rat bar
Bunker (Upper Caves)
Some wall breaches in Lower Underrail lead to these adjoining caverns. They are inhabited mostly by various wildlife and largely devoid of human life, except the occasional bandit camp here and there. Ruins of old military facilities can be found even in these caverns, despite them not being directly connected to Lower Underrail's systems.
All sorts of critters reside in these caverns, and few humans can be occasionally met.
- Rathounds, Rathound Alphas, Pigs, Warthogs, Azuridae, Dogs, Burrower Spawn, Burrowers, Crawlers
- Lurker Smugglers
Upper Caves Global Map
This part of Upper Caves is initially accessible for the most part. They area near the South Gate area. Some passages must be opened with TNT Charges.
Upper Caves A1, connects to south Lower Underrail
Upper Caves A6, connects to GMS compound
Upper Caves A6x, connects to Hephaestus Research
Upper Caves A7, connects to northwest Lower Underrail
Upper Caves A11, Milton's camp
Upper Caves A12, connects to east Lower Underrail
This part of Upper Caves becomes accessible once the player has TNT Charges or Jackhammer. If entering from Lower Underrail, they are located north of Rail Crossing train station. If entering through other Upper Caves, they are north of Milton's camp.
Upper Caves B3 (north of Hephaestus Research)
Upper Caves B8 (west of Lost Vault)
Upper Caves B12, Bunker entrance
Upper Caves C6, lunatics and climbable route up (leads to outside of Hecate Research Outpost)