A Cold War mission near Thule ended in radioactive fallout and exposed the risks behind Washington’s military presence on the Arctic island The US, Denmark, and Greenland have signed a new agreement to expand American military activity on the island. Washington calls Greenland vital to its security, but an expanded military presence also raises an older question: What risks does the Arctic island take on in return?The agreement builds on a defense partnership dating back to 1951. That history includes an episode that brought the risks of Washington’s Cold War strategy into sharp focus: An American mission over Greenland that ended in a nuclear disaster.The nuclear patrols over GreenlandIn the 1960s, in the middle of the Cold War, the US Air Force launched Operation Chrome Dome. This mission implied keeping bombers armed with nuclear weapons on continuous airborne alert, ready to strike the USSR if necessary. If you’ve seen the film ‘Dr. Strangelove’, you’ll remember that Major T.J. ‘King’ Kong’s crew was involved in such a patrol mission. Read more Britain and Russia have been to war before. Ask the British fleet how that went Theoretically, this strategy was feasible: It would have made it impossible for the USSR to disarm the US with a single blow. However, in practice, as the number of nuclear-armed aircraft patrols increased, so did the number of incidents involving nuclear weapons.Then-US Secretary of Defense Robert McNamara advocated for ending this program, arguing that Americans had already established an effective early warning system for ballistic missile launches, so the US could take fewer risks and cut costs. However, the Strategic Air Command resisted this idea, fearing it would decrease their importance and result in budget cuts. A horrific incident occurred in 1966 over Spain when a bomber collided with a refueling tanker aircraft, resulting in several fatalities and nuclear bombs landing on beaches and in the Mediterranean Sea. Despite this incident, the US considered the nuclear threat from the USSR a matter of primary importance, one which justified any security measures. Eventually, after intense debates, a compromise was reached: The number of patrolling bombers would be reduced, but the airborne patrols would continue.Thule Air Base in northern Greenland was established in the 1950s. A Mercator projection map gives a distorted sense of distance; in reality, its location was very convenient for potentially launching missiles at the USSR and monitoring missile launches from there. It also provided a convenient vantage point for reconnaissance of the Novaya Zemlya Soviet nuclear test site. An aerial view of radar domes at the 3rd Detachment, 3rd Space Support Wing facilities at Thule Air Base. © Global Look Press/IMAGO Thus, the US Strategic Air Command built a military base in northern Greenland. The name referred to ‘Ultima Thule’ (farthest Thule) – a mythical island at the edge of the world. The base housed bombers, reconnaissance planes, radar systems, missile launch sites, and early-warning radars. In its most active period, Thule base housed about 10,000 personnel. Additionally, the US launched the highly classified Project Iceworm, which aimed to build a wide network of nuclear missile launch sites concealed in tunnels beneath the ice. One could say Greenland became thoroughly inhabited.Seven men, four hydrogen bombs, and a fire in the skyOn January 21, 1968, a B-52 bomber rose into the air, carrying four megaton bombs. It took off from New York to visually monitor the nuclear alert system, bearing four thermonuclear bombs, each with a yield exceeding one megaton. Read more The ‘stab in the back’ that wasn’t: Why Stalin sent the Red Army into Poland The standard crew consisted of five members; however, a third pilot and a substitute navigator were included on the mission. Everything started out smoothly. But eventually, the factor of human error came into play.The third pilot, Major Alfred d’Amario, took aboard a few cloth-covered foam cushions to make his flight more comfortable. He placed the cushions under the instructor navigator’s seat and went to replace co-pilot Leonard Svitenko, who went to take his rest period. The cushions remained in place. Not long after, the pilots opened an engine bleed valve which channeled hot air from the engine to the heater. Unfortunately, the heater was defective and quickly became dangerously hot. At some point, the pilots noticed the smell of burning rubber filling the cockpit. While they searched for the source of the burning, a fire had already started onboard. The navigator went looking for the flames, and, on discovering the fire, attempted to extinguish it using two fire extinguishers. However, he was unable to put it out. Captain Haug, the aircraft commander, requested an emergency landing at the airbase. All the extinguishers had been used, but the fire continued to spread. Smoke thickened to the point that the crew could hardly see each other in the cockpit. Ultimately, as the plane neared Thule Air Base, Haug ordered everyone to abandon it. American Boeing B-52 Stratofortress, about 1960. © Camerique/Getty Images Out of the seven crew members, six managed to eject relatively safely. Tragically, co-pilot Leonard Svitenko sustained fatal head injuries while trying to escape. Haug and d’Amario landed directly on the airbase grounds. The base personnel immediately mobilized to search for the remaining crew. A polar night enveloped Greenland, and the weather was dreadful. A representative of the Royal Greenland Trade Department, Jens Zinglersen, significantly eased the search efforts by contacting local Inuit residents who organized dog sled teams. Thanks to their collective efforts, three other aviators were found – they had landed within a mile and a half of the base and were quickly located. Read more The West calls it Russia’s Starlink. That misses the point Gunner Staff Sergeant Calvin Snapp was less fortunate. He ejected first and landed nearly 10 km from the base in -30C degree temperatures. Wrapping himself in his parachute, he waited for help for 21 hours before being rescued by a search team. Miraculously, they found him alive, though severely hypothermic.But the worst was yet to come. The aircraft carrying thermonuclear munitions was still flying northward and burning up. Finally, it crashed onto the ice about 12 km west of the airbase. There was still plenty of fuel onboard; it ignited on the ice, causing spectacular pyrotechnic effects. The bomb’s non-nuclear explosives detonated, partially melting the ice and scattering radioactive debris everywhere.There was another poignant detail, however. Greenland belonged to Denmark, which had declared its entire territory a nuclear-free zone. And now, a bomber armed with nuclear weapons had crashed there – though the Danes (at least those who didn’t work in the government) were unaware that there was also radioactive debris all over the ground. The Danish government quickly issued a statement claiming that the aircraft was not in Greenland’s airspace and had only entered it due to an onboard emergency. This was a complete fabrication, but it served as a cover-up for the situation. The US found itself in a delicate situation that urgently needed fixing.Cleaning up a nuclear disaster in the Arctic nightThe cleanup operation was dubbed Project Crested Ice (or unofficially, ‘Project Doctor Freezelove’). The operation was led by General Richard Overton Hunziker, a seasoned veteran and WWII hero. Contaminated ice being loaded into steel tanks for shipment to the US during Project Crested Ice, 1968 © United States Air Force / Wikimedia Commons / Public Domain A team of scientists, nuclear specialists, and a massive number of troops were dispatched to Greenland. Their mission was to remove all radioactive materials before spring arrived and the contaminated ice would be carried off into the ocean. The polar night brought fierce winds and bitterly cold temperatures, making the task even more challenging. Radioactive elements were scattered across a 1-mile (1.6 km) by 3-mile (4.8 km) area. In the midst of it was an ice hole measuring 50 meters in diameter. A blackened patch measuring 670 by 120 meters and heavily contaminated with uranium and plutonium was clearly visible from the air. Read more How 9/11 turned a terrorist attack into a generation of war The US suggested to the Danish authorities that they should just wait for spring when the ice would melt and everything would sink into the Arctic waters. But Denmark was outraged. The Americans were given a choice: Either clean up their mess or close down the Thule base and leave Danish territory.It must be said that Hunziker and his team worked heroically. They established a small town on the ice, complete with igloos, a power station, a runway, a communications hub, and a decontamination chamber. An icy road connected them to the airbase.Thousands of people toiled under the harsh conditions, illuminated by floodlights as they cut through the contaminated ice, loaded it onto transports, and hauled it to storage, where it was boxed up in tanks for shipping back to the US. Ice was collected using graders, packed into wooden crates, which were then loaded into steel tanks and onto ships. Debris was recovered manually – some pieces were sizable, but the smallest were no bigger than a battery. Contaminated areas were identified using simple Geiger counters.The cleanup crew worked with minimal protective clothing. Most people simply wore their regular Arctic expedition clothing. By mid-September 1968, the operation was officially concluded. In total, 1,700 Danes and 700 Americans participated in it. While the disaster was a stark illustration of the consequences of foolish and irresponsible behavior, the cleanup crew – which braved the harsh cold and literally gathered radioactive waste by hand – accomplished real feats, which, however, remained largely forgotten. Inuit people near Thule Air Base, Greenland, 1968 © Joseph Thomas / Wikimedia Commons / Public Domain What the ice couldn’t buryIt’s believed that around 93% of the radioactive materials were collected, but some remnants remained on the seabed. One hydrogen bomb likely sank among other debris. Attempts to locate it with a submersible were unsuccessful. A heap of wreckage was discovered on the ocean floor, and somewhere down there, it appears that the remains of the nuclear weapon still lie undisturbed. Read more The next war will be fought here. America and Europe will be enemies In the 1980s and ‘90s, a scandal erupted. Danish cleanup workers launched a legal battle against the American government. Though they lost the case, they succeeded in forcing the release of numerous classified documents. Subsequent investigations revealed that cancer mortality rates among Danish workers involved in the cleanup operation were about one and a half times higher than those of the general population. It also turned out that the health monitoring of the cleanup crews after the incident was inadequate. Ultimately, officials concluded that radiation exposure wasn’t significant and found no link between the increased cancer rate and the 1968 accident. A heated debate arose around the actions of Danish prime ministers Jens Otto Krag and H. C. Hansen. Krag portrayed himself as a naïve yet honest figure, insisting that he wasn’t aware of aircraft carrying nuclear weapons over Greenland. However, declassified US documents indicated that the Danish government was aware of everything. As for Hansen, he was the one who secretly approved the US to use Thule Air Base as part of its nuclear shield. However, by then, both prime ministers had passed away, and were unable to answer to the population. After the incident, Operation Chrome Dome was officially shut down. After all, it was the second nuclear disaster in three years, and that was too much even for the ‘hawks’. Secondly, both Russians and Americans already had plenty of missiles, and the use of bombers seemed somewhat archaic. Finally, the USSR and the US initiated another period of détente and developed protocols for handling any accidental incidents involving nuclear weapons. While this didn’t help those who suffered or died from cancer as a result of the accident in Greenland, it did significantly reduce the risk of similar events in the future.