I wanted to combine some elements of scifi along with a traditional 'dungeon' because, let's face it, rummaging around dungeons in the dark chasing bugs is fun as hell.
Ways I see it, this is a small outpost, just starting to be dug out, perhaps in an effort to hide them from the Empire, and part of the tunnel system collapsed. Maybe a last, desperate communication was sent and then the outpost went dark.
What happened? Sounds like a job for your little crew of ne'er-do-wells.
And the black and white version: