One thing to remember is the numbers between the Atlantic and Pacific. The number of ships and subs involved was much greater in the Atlantic which is smaller than the Pacific. The ship densities makes the Pacific numbers smaller. If the density matched the Atlantic, I suspect the tonnage sunk / subs lost to be much closer.
Stealing a line from a movie, Its like comparing apples and oranges, but its all fruit.
Yes the Japanese had sonar, not every escort did, but often one ship did in a convoy. They also had radar dispersed in a like manner.
Other Pacific sub movies - Run Silent, Run Deep - Torpedo Run - Destination Tokyo. Older films with varying value.
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