The southern Japanese city of Nagasaki on Saturday marked 80 years since the U.S. atomic attack that killed tens of thousands and left survivors who hope their harrowing memories can help make their hometown the last place on Earth to be hit by a nuclear bomb.

The western Japanese city was levelled on Aug. 9, 1945, when the United States dropped a 10,000-pound plutonium-239 bomb, nicknamed “Fat Man”.