yeah I agree with those who think Charlie should have just ran out and closed the door behind him. I would have rather seen him swim out and get stuck or something and drown that way if he was gonna die. The way it happened didn't seem necessary. The only reason I can think of was that he was trying to save Desmond and prevent the rest of the station from flooding, but if thats the case then still he could have ran out of the room and then closed the door.

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Doctor playing golf. Woo, boy howdy, now I've heard everything. What's next, cop eating a donut?