Project Habakkuk: The WW2 plan to build an Aircraft Carrier out of Ice? During World War II, the U.S. considered an innovative plan called Project Habakkuk, which aimed to build an aircraft carrier from ice and wood pulp. The concept involved creating a massive floating vessel known as "Pykrete," a mixture of ice and sawdust, to withstand enemy fire. The carrier would be capable of launching and recovering aircraft in harsh Arctic conditions, but the project was ultimately abandoned due to logis