Factual error: The Thunderfish is closing on the Japanese I-boat, at under 6000 yards, Duke orders flank speed. The hydrophone operator on the I-boat would have to be deaf not to pick up the noise of Thunderfish's propellers at flank speed. For those pundits who claim that their sonar might be down, hydrophones are a passive listening system.
Operation Pacific (1951)
1 factual error - chronological order
Directed by: George Waggner
Starring: John Wayne, Ward Bond, Patricia Neal, Scott Forbes
Continuity mistake: Sometimes when they are looking through the periscope, the sub view is going the opposite direction than the periscope view is.
Ens. Caldwell: Gee, that's the first time I ever saw a sub get knocked off.
Question: Why did Cmdr. Gifford (John Wayne) give Ens.Caldwell a bad look when he said it was the first time he had seen a sub knocked off?
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