As the Copperfin is approaching their rendezvous in the Aleutians, they are submerged at periscope depth. The man on the sonar calls out depths of 1000 and 800 fathoms (6000 and 5400 feet respectively). The scene changes to show the boat moving submerged with the ocean bottom clearly visible only a couple of hull heights below.
If the bottom were 5,400 feet below, it would not be visible sunlight only penetrates approximately 600 feet.
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05/03/2025 alle ore 07:18
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