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What became of the World War I fleet was almost as intriguing and bizarre as the concept of concrete ships itself.

A Ship Made of Concrete? They Actually Existed During World War II The fate of the remaining World War II concrete fleet was not as unique or entertaining as their predecessors of World War I. Here's What You Need To Remember: The use of concrete was sparked by wartime shortages of steel; as they say, "Necessity is the mother of invention." It is a fact that war has sparked some amazing innovations. It has at the same time spawned incredible desperation. The attempt by the U.S. Navy in both world wars to construct seagoing vessels made of concrete would seem to be a combination of the two at...

>> 50 to 70 people. >> 50 to 70, 5-0 to 7-0 people? >> yes. it's of considerable size. with enough capacity to serve a large area and the idea is to have them spread in a sway that everybody has a chance to access one within a reasonable amount of time, basically responding to tsunamis in places maybe the warning doesn't reach or there isn't any warning, remote places. >> have you -- have you been able to try something like this out? there's a patent for it. it's not manufactured yet, correct? >> that's correct. we're working. we need research on the development and prototyping. but i can tell...