Chosen answer:The hybrids kept prisoner in it were digging an escape tunnel. They were gassed before they could finish it. Mulder was able to finish digging out.
Trivia: In this episode Tobin Bell's character resides in apartment number 24. Two years later, Tobin Bell played Peter Kingsley in the second season of ... 24.
Chosen answer: The hybrids kept prisoner in it were digging an escape tunnel. They were gassed before they could finish it. Mulder was able to finish digging out.
Grumpy Scot