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>Operation Crested Ice
"Operation Crested Ice was a joint Danish-American cleanup operation initiated after a United States Air Force B-52G Stratofortress bomber, call sign HOBO 28, crashed on January 21, 1968, near Thule Air Base in Greenland.
The aircraft was on an airborne nuclear alert mission, carrying four B28FI thermonuclear bombs, when a cabin fire—caused by foam cushions igniting due to overheated bleed air—forced the crew to abandon the plane.
Six of the seven crew members ejected safely, but the co-pilot, Captain Leonard Svitenko, died during ejection.
The unmanned bomber continued flying before crashing onto sea ice in North Star Bay, approximately 7.5 miles west of Thule Air Base.
Upon impact, the conventional high-explosive components of the four nuclear bombs detonated, dispersing radioactive materials such as plutonium, uranium, and tritium across a wide area, creating a contamination zone that resembled a dirty bomb.
The crash violated Denmark’s nuclear-free zone policy, as Greenland was a Danish territory, and caused significant diplomatic strain between the two nations.
The U.S. initially wanted to leave the wreckage in the fjord, but Denmark insisted on removing all debris and contaminated ice, leading to the launch of Operation Crested Ice.
The operation, which lasted from January 1968 to September 13, 1968, involved over 700 personnel from both countries and more than 70 U.S. government agencies.
It was conducted under extreme Arctic conditions, with temperatures dropping as low as −76 °F (−60 °C), wind speeds reaching 89 mph (40 m/s), and continuous darkness until mid-February.
The cleanup effort included building temporary roads over thickened ice, using Inuit dog sled teams for transport, and constructing igloos to shelter workers.
Radiation surveys were conducted using instruments like the FIDLER portable scintillation counter developed by Lawrence Livermore National Laboratory, which proved critical in mapping contamination.
A total of over 550,000 U.S. gallons (2,100 m³) of contaminated liquid and thirty tanks of hazardous material were collected at a temporary Tank Farm before being shipped to the United States.
The operation cost an estimated $9.4 million at the time, equivalent to about $85 million in 2024.
The crash, along with a similar incident at Palomares, Spain, in 1966, led to the end of Operation Chrome Dome, the airborne nuclear alert program, due to the growing political and operational risks.
Despite the extensive cleanup, questions remain about the fate of one of the four bombs. While parts of three bombs were recovered, the fourth remains unaccounted for, with speculation that it may lie on the seabed near Canada’s Arctic waters, though U.S. documents declassified in 2008 stated no nuclear weapon was left in the sea.
The incident continues to be a subject of debate, conspiracy theories, and concern over long-term environmental and security implications."