Date of Loss: 4 July, 1944
Returned to Service: No
Performed six war patrols, all in the Aleutian Islands area before being assigned to training duty at Pearl Harbor.
Foundered off Honolulu, HI in 8,400 feet of water during a training dive. The only trace ever found of S-28 was a slick of diesel fuel. Submarine never located.
According to the Court of Inquiry, "The exact cause of the loss of S-28 cannot be determined."
Fifty men lost, no Survivors.
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