Visible crew/equipment: When Rev. Scott swims up the first stairwell, after pushing aside the dead crew member, as his head comes up the shaft, you can see, very quickly, the flippers of a crewmember swimming out of the shot behind him. (01:22:55)
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The Poseidon Adventure (1972)
Trailers
Directed by: Ronald Neame
Starring: Gene Hackman, Leslie Nielsen, Ernest Borgnine, Shelley Winters, Red Buttons, Stella Stevens, Carol Lynley
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Mike Rogo: You weren't on the streets that long! How many guys did you know! Do you realise how slim even one of those characters is on this boat.
Linda Rogo: You don't have to shout.
Mike Rogo: I said do you realise...
Linda Rogo: I heard what you said.
Trivia: The look of the set for the upside down engine room was so real, the actors refused to climb anything, fearing that it would fall. The set designer and builders had to climb it first to prove it would hold.
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Answer: Because he doesn't boil, there's no suggestion that the water is that hot. After Ackers falls in, and while Rogo tries to save him, there are two large explosions in the shaft; we can presume that, while Rogo was able to escape, Ackers was injured/trapped/otherwise incapacitated below the surface, and drowned.