The Moment of History on Instagram: "“Cannikin” is the code name for the most powerful underground nuclear test in the history of the United States. It was conducted on November 6, 1971, on Amchitka Island in Alaska during the Cold War. During the test, a thermonuclear warhead with an estimated yield of about 5 megatons of TNT was detonated at a depth of more than 1.7 kilometers underground. The explosion caused strong seismic effects: the ground rose by several meters, and shock waves were felt