The largest US underground bomb was detonated on Amchitka Island, a remote Alaskan island.
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Prospect Creek Camp in Alaska recorded -80°F, making it the coldest temperature recorded in US history.
The first of 126 nuclear tests started at the Nevada Test Site.
North Korea tested its first intercontinental ballistic missile (ICBM).
Nine thousand scientists from 43 nations signed a petition to ban nuclear testing.
The US SM-65 Atlas missile completed the first successful intercontinental ballistic missile launch.
