On 21 January 1968, an aircraft accident (sometimes known as the Thule affair or Thule accident involving a United States Air Force (USAF) B-52 bomber occurred near Thule Air Base in the Danish territory of Greenland.
The aircraft was carrying four hydrogen bombs on a Cold War “Chrome Dome” alert mission over Baffin Bay when a cabin fire forced the crew to abandon the aircraft before they could carry out an emergency landing at Thule Air Base. Six crew members ejected safely, but one who did not have an ejection seat was killed while trying to bail out. The bomber crashed onto sea ice in North Star Bay, Greenland, causing the conventional explosives aboard to detonate and the nuclear payload to rupture and disperse, which resulted in radioactive contamination.
The United States and Denmark launched an intensive clean-up and recovery operation, but the secondary stage of one of the nuclear weapons could not be accounted for after the operation completed. USAF Strategic Air Command “Chrome Dome” operations were discontinued immediately after the accident, which highlighted the…
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