GMS compound

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First major "dungeon" the player visits during Underrail storyline. It is located in Lower Underrail, and can be accessed via the Lower Underrail exit from South Gate Station, by heading north from the station platform on SGS level 1.

The player travels there during Gorsky's task and is tasked with finding a way to open the sealed door on the first level of GMS compound.

Level 1

The initial level, full of rathounds. Contains a large sealed door near the entrance.

An Omni-Tool can usually be found somewhere on the first level, and it proves to be useful as the whole compound proper is full of accessible ventilation shafts.

The power generator for the whole compound is also on this level.

Rathound nest

A natural cave with even more rathounds in it.

Level 2

A level largely devoid of living creatures. Armed Sentry Bots roam around.

Level 3

A small settlement, recently taken over by raiders.

Burrower hive

Burrower nesting area near the GMS compound.