Matashichi Oishi, a victim of the 1954 U.S. hydrogen bomb test on Bikini Atoll in the Marshall Islands, has been crusading for a world free of atomic weapons and nuclear power plants.

But far from being driven by merely a hatred of nuclear weapons, Oishi's motivation is also his "grudge" against what he sees as an injustice by the Japanese government over the controversial tests.

Oishi, 81, was just 20 when he and 22 other tuna fisherman on the Fukuryu Maru No. 5 (known as the Lucky Dragon) encountered a cloud of "death ashes" following an H-bomb test in the Pacific Ocean on March 1, 1954.