Seemingly forgotten to history, a U.S. Air Force B-52 bomber with four hydrogen bombs on board crashed in Greenland, located 750 north of the Arctic Circle.
The plane went down in January 1968 near Thule Air Base after a cabin fire forced the crew to abandon the plane. Six crew members were able to eject out of the plane but one died.
Three of the four bombs were accounted for and were the subject of a lengthy cleanup effort, involving both U.S. and Danish officials. None of the bombs actually went off as they weren’t armed by the crew.
The BBC reported several years ago that the fourth nuclear warhead was abandoned in the ice after a massive operation to recover the debris resulted in the collection of 500 million gallons of ice--some of which had radioactive materials from the bombs.
