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The PCs are stranded on a moon due to a mysterious disruption of their equipment. Stranded they go exploring for anything that might repair their craft. They then find a large, pyradmidal structure on this moon. Gradually they will discover that the base was abandoned by the Deevils (or demons).

Looking for ideas for rooms or encounters while exploring the abandoned base. What things would such beings have aboard their bases? Slave pens? A sacrificial temple? A library? I want it to be a mix of magic and high-technology. Any ideas would be helpful. Thank you.

The big question why was it abandoned? Is the cause still hanging around?

I'm thinking that they feared they were going to be invaded and the deevils or the demons either teleported out of there, or committed suicide so that they could safely escape back to Hades or Dyvel. The characters might find the gory remains of their slaves and staff, who left on their own, went mad and killed each other.

Or something WORSE came in and made the daemons / deevils WISH for death.
...and the uninvited party crasher(s?) decided to stay deep in the heart of the base