The Shore of Hope (1967)

The film is set on an island in the Pacific where a hydrogen bomb is being tested. A group of local fishermen die from radiation sickness. The inventor of the bomb, American scientist Thomas Sherwood, also receives a large dose of radiation and is now terminally ill. Once he professed the theory of "redemption through his own suffering," but now, in the face of death, he realized that such atonement does not benefit anyone.