Yumenoshima (literally "Dream Island") is a district in Kōtō, Tokyo, Japan, consisting of an artificial island built using waste landfill.
Daigo Fukuryū Maru was a Japanese tuna fishing boat, with a crew of 23 men, which was exposed to, and contaminated by, nuclear fallout from the United States's Castle Bravo thermonuclear device test on Bikini Atoll, on March 1, 1954.
Today, Yumenoshima houses the Daigo Fukuryū Maru; the boat was modified as a training vessel following the exposure, and later abandoned near Yumenoshima.