The Lost Secret of the Minnesota WWII ‘Ice Lab’

During the height of World War II, the most important "front line" for American pilots wasn't in the European or Pacific theatres - it was in a top-secret hangar in St. Paul, Minnesota.

As the U.S. began sending the B-24 Liberator bombers on dangerous Arctic routes to reach the war zones, they ran into a deadly enemy. It wasn't the Germans or the Japanese, but rather, the ice.

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Back in those days, flying was in its infancy. Airplanes had been around for less than 40 years, yet the world's preeminent militaries were already using them in the thousands. When the U.S. entered the fray in late 1941, flying conditions for American pilots were intense, having nothing to do with their adversaries. Planes were falling out of the sky because their engines and wings couldn't handle the sub-zero temperatures. To solve this, the U.S. government turned to Northwest Airlines, which was headquartered at the St. Paul Downtown Airport, also known as Holman Field.

But remember, this was the American age of ingenuity, so engineers immediately got to work. They turned an enormous hangar into a high-tech "Ice Lab" of sorts. It was one of the most secretive military installations in the entire Midwest. These Minnesota engineers worked around the clock to "winterize" thousands of bombers that were about to head to the front lines, in both Europe and the Pacific. These builders weren't just fixing engines; they were legitimately inventing the tech that allowed modern aviators to fly in the extreme cold conditions they would inevitably be facing against the Germans and Japanese.

The centerpiece of this lab was a B-24 bomber nicknamed the "Ice Wagon". It was outfitted with specialized sensors and experimental de-icing equipment. Pilots would wait for the worst Minnesota winter storms possible and intentionally fly the planes directly into the epicenter, hunting for the most dangerous icing conditions possible, just to see if their new inventions would hold up.

By the time the war was over and the U.S. emerged victorious, over 3,000 aircraft had passed through the St. Paul modification center. While the "Ice Lab" no longer exists, every time you see a plane take off in a snowstorm today, you're seeing the legacy of the secret work done in the great state of Minnesota.