Listening to this episode about the Allied Forces thinking of new ways to defend against German U-Boats sinking merchant ships that crossed the Atlantic Ocean they developed an idea of trying to use ice to prevent against U-Boat attacks. So they tinkered and found Pykrete which is just ice and wood fibers. Very interesting stuff.

They didn’t move forward with building an aircraft carrier with this material because the amount of manpower and materials made it impractical but it is definitely cool to learn that this material was even considered. I found an only mythbusters episode about the material.