11. Project Habakkuk
During World War II, the U.S. and Britain collaborated on Project Habakkuk, aiming to construct massive aircraft carriers from ‘pykrete’—a mixture of ice and wood pulp—to withstand submarine attacks. Prototypes were built, but practical issues, including high costs and technical challenges, led to the project’s abandonment. The concept highlighted the lengths to which nations would go to develop innovative military solutions. (en.wikipedia.org)
