Daigo Fukuryū Maru (第五福竜丸?, Lucky Dragon 5) was a Japanese tuna fishing boat, which was exposed to and contaminated by nuclear fallout from the United States' Castle Bravo thermonuclear device test on Bikini Atoll, on 1 March 1954.
Aikichi Kuboyama, the boat's chief radioman, died less than seven months later, on 23 September 1954, suffering from acute radiation syndrome. He is considered the first victim of the hydrogen bomb of Operation Castle Bravo.
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