Star Trek: Deep Space Nine, season 3, episode 7
Civil Defense
Summary
Deep Space Nine is progressively locked down after O'Brien, Jake and Sisko accidentally activate an automated Cardassian security program. The program's counter-insurgency measures keep escalating until it initiates an auto-destruct. Gul Dukat beams on board, but is unable to stop the self-destruct sequence.
Summary from Wikipedia, CC BY-SA 4.0.
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