The Story of Pykrete: That Time the Navy Built a Ship Out of Ice and Sawdust

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World War 2 was a period of rapid innovation, one of the scant few upsides of war. Crazy ideas were being floated left and right. An aircraft carrier built onto an iceberg was one of them. Though that never saw the light of day, a test ship made from ice was built that was 18 meters long and 1,000 tons on Patricia Lake in the Canadian Rockies.