During WWII, engineers seriously planned an Arctic war aircraft carrier made of ice. Project Habakkuk sounds ridiculous—until you see why it almost worked.
Completed late in World War II, one Japanese aircraft carrier entered service without a functional air group due to severe ...
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When Did Battleships Become Obsolete?

Though battleships saw extensive and meritorious service in World War II, the conflict exposed their weaknesses against the rising power of the aircraft carrier.