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

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