- Feb. 22, 2000
- Location where U.S. military aircraft photographed atomic cloud over Hiroshima identified as 9,000 meters above ground off Matsuyama
- Feb. 21, 2000
- A-bomb exploded 580 meters in air, leaving 257 confirmed dead in former Saiku-machi, with 304 area people, including those on commute or mobilized for work, perishing
