The Tsar Bomba with 50 Megaton was the biggest test conducted so far in our known history.
Meanwhile at the other side of this planet:
“The first shot, Bravo, the largest single nuclear explosion conducted by the United States, with a destructive capability more than one thousand times that of the Hiroshima bomb, was detonated on 1 March 1954. The explosion was so powerful it vaporized several small islands …”
“…To this day, peoples of Rongelap, Bikini, Enewetak, and many in the Marshall Islands continue to suffer from cancer, miscarriages, and tumors.”
https://www.wagingpeace.org/the-nuclear-history-of-micronesia-and-the-pacific/
Published by:
Richard Salvador
August 20, 1999