The first USS Spadefish (SS/AGSS-411), a Balao-class submarine, was the first ship of the United States Navy to be named for the spadefish. Although she was commissioned late in the war and spent only one year in the Pacific war zone, she was able to run up a record of 88,091 tons in 21 ships and numerous trawlers sunk.

The Balao class was a design of United States Navy submarine used during World War II, and with 120 boats completed, the largest class of submarines in the United States Navy. An improvement on the earlier Gato class, the boats had slight internal differences. The most significant improvement was the use of thicker, higher yield strength steel in the pressure hull skins and frames, which increased their test depth to 400 feet (120 m). Tang actually achieved a depth of 612 ft (187 m) during a test dive, and exceeded that test depth when taking on water in the forward torpedo room while evading a destroyer.