From Supernatural – Season 12 Episode 21: ‘There’s Something About Mary’ (12×21) | TV series produced by The CW
(Ketch traps Sam, Dean and Toni in the bunker...)
Arthur Ketch: Your bunker is an excellent fortress. An even better tomb. So we've rejiggered the locks, we've shut off the water, and once we leave, the pumps that bring in the air shall reverse. Your oxygen should be gone in... two days, maybe three. You dying in here, it's almost... poetic, hmm?
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