Daigo Fukuryū Maru
The fallout from the March 1954 "Bravo" test in the Pacific Ocean had "scientific, political and social implications that have continued for more than 40 years". The multi-megaton test caused fallout to occur on the islands of the Rongerik and Rongelap atolls, and a Japanese fishing boat known as the "Daigo Fukuryū Maru" (Lucky Dragon). Prior to this test, there was "insufficient" appreciation of the dangers of fallout.