Steel is scarce. Wood is not an option. And you need a boat now. These wartime circumstances drove innovation in all kinds of crazy directions, and one somewhat less crazy direction — concrete boats.
Steel is scarce. Wood is not an option. And you need a boat now. These wartime circumstances drove innovation in all kinds of crazy directions, and one somewhat less crazy direction — concrete boats.
Japanese authorities, wanting to better protect communities in future, chose to build bigger defenses. Concrete walls that span 400km and reach nearly 15 meters high in places now line the coast to ...
One of the most bizarre episodes in U.S. naval history was the construction of ships built from concrete. Born of desperation, the ships were designed to carry military cargo during the World Wars.
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