The opening scene of the Bingo Maru being obliterated by Godzilla's first attack and later scenes of survivors of other attacks being found with radiation burns, were inspired by the U.S. testing of a hydrogen bomb on Bikini Atoll. A real Japanese fishing ship, the Lucky Dragon 5, was overwhelmed when the U.S. Castle Bravo nuclear test had a yield of 15 megatons rather than the planned 6 megatons. Military personnel, island natives and several Lucky Dragon 5 crew members, persons believed to be in a zone of safety, suffered from radiation sickness and at least one died six months later. This created widespread fear of uncontrolled and unpredictable nuclear weapons, which the film makers symbolized with Gojira. The actual event played a major role in drawing attention to the hazards of nuclear fallout, and concerns were widespread about radioactively contaminated fish affecting the Japanese food supply.