This underwater nuclear explosion was conducted by the United States in 1958. The explosion was part of a series of experimental nuclear explosions called Operation Hardtack I. Location: United States nuclear test site in the Pacific Ocean near Inuit Atoll and Bikini Atoll (now the Marshall Islands). Explosion power: Wahoo: approximately 9 kilotons. Umbrella: approximately 8 kilotons. Which can usually show its destructive power about three kilometers from a city
