Squalus was a diesel-powered submarine built in 1937 at Portsmouth Navy Yard. The submarine was commissioned in 1939, with Lieutenant O.F. Naquin in command. In 1939, during a series of test dives, the ship flooded and sank. 26 crew members were lost and 33 survived. The ship was refloated, repaired, and recommissioned under the name Sailfish in 1940.
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