Claim: Operation Wigwam was tested underwater in 1951 at the Pacific Ocean off California, a state in the Pacific Region of the United States of America.
Evidence: 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.