Operation Wigwam involved a single test of the Mark 90 "Betty" nuclear bomb. It was conducted between Operation Teapot and Project 56 on May 14, 1955, about 500 miles (800 km) southwest of San Diego, California. 6,800 personnel aboard 30 ships were involved in Wigwam. The purpose of Wigwam was to determine the vulnerability of submarines to deeply detonated nuclear weapons, and to evaluate the feasibility of using such weapons in a combat situation. The task force commander, Admiral John Sylvester, was embarked on the task force flagship USS Mount McKinley. Wigwam was the first atomic test in the deep ocean, and it remains the only test that has been conducted in water deeper than 1,000 ft (300 m).

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DVD Copied by The Department of Energy, in cooperation with the Department of Defense, declassified a series of historical films on the nuclear weapons program. They were converted to videotape format to help preserve the films and to facilitate the declassification and release process. These films document the history of the development of nuclear weapons, starting with the first bomb tested at Trinity Site in southeastern New Mexico in July 1945..

Publication date 1955 Department of Energy