[kach22i]

https://thedayintech.wordpress.com/page/6/

On March 17, 1966, Alvin was used to locate a submerged 1.45-megaton hydrogen bomb lost in a United States Air Force midair accident over Palomares, Spain. The bomb was found resting nearly 2,990 ft. (910 meters) deep, and was raised intact on 7 April.