Revealing mistake: At the beginning, when Gail is attacked by a moray eel - we don't see it, but that's the assumption - and she is banged against the sunken wreck of a ship, and then, when she is released, her mouthpiece is not in her mouth and she tries to swim to the top as fast as she can - all of this is done by a stunt double, understandably, we can see this by her hair, which is much thinner and straighter than Jacqueline Bissett's hair.
The Deep (1977)
1 revealing mistake
Directed by: Peter Yates
Starring: Nick Nolte, Robert Shaw, Jacqueline Bisset, Dick Anthony Williams
Plot hole: If the vacuum is strong enough to suck up a hand grenade, why isn't it sucking up the ampules?
David Sanders: I'm goin' down there, and you're gonna have to blow me up too.
Romer Treece: As you please, boy.
Trivia: Author Peter Benchley has a cameo as a U-boat crewman in the prologue (extended version).
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