Elf: Captain, this is creeping me out. We haven't met anybody. No hostiles, no surrrenders, no corpses.

Both passive and active scanning show that people were here, and haven't been gone long. We've got a few more decks to look at, but pulse scans from 'Chelle and Tchukk say they're empty.
Captain Tagon: Maybe they all committed suicide in an incinerator?
Elf: Thank you, sir. You just cranked the "creep-out" factor up a notch.
Captain Tagon: If you'd like, I can have Ennesby pipe some harpsichord music over the common channel.