On March 1, 1954, the U.S. exploded a hydrogen bomb at Bikini in the South Pacific. The fifteen-megaton bomb was a thousand times more powerful than the atomic bomb that destroyed Hiroshima, and its fallout spread far beyond the official "no-sail" zone the U.S. had designated. Fishing just outside the zone at the time of the blast, the Lucky Dragon #5 was showered with radioactive ash. Making the difficult voyage back to their homeport of Yaizu, twenty-year-old Oishi Matashichi and his shipmates became ill from maladies they could not comprehend. They were all hospitalized with radiation sickness, and one man died within a few months. The Lucky Dragon #5 became the focus of a major international incident, but many years passed before the truth behind U.S. nuclear testing in the Pacific emerged. Late in his life, overcoming social and political pressures to remain silent, Oishi began to speak about his experience and what he had since learned about Bikini. His primary audience was schoolchildren; his primary forum, the museum in Tokyo built around the salvaged hull of the Lucky Dragon #5. Oishi's advocacy has helped keep the Lucky Dragon #5 incident in Japan's national consciousness.