It seems like pure folly to build a ship—let alone a giant aircraft carrier—out of ice, but during World War II, that is exactly what inventor Geoffrey Pyke proposed the Allies do. While plain ice—the kind put in drinks—is not strong or durable enough for such a task, Pyke believed a composite material made of wood pulp and ice would be. For much of 1943, a multinational team based in Canada toiled to realize a ship made of pykrete—a portmanteau of Pyke and concrete. Did the project succeed? Discuss