This Memorial Day, as we honor the brave men and women who gave everything in service to our country, we also take a moment to remember one of the more surprising innovations from our military history – concrete ships.
During both World Wars, especially World War II, the demand for steel skyrocketed. It was urgently needed for tanks, planes, and warships. That shortage led engineers to an unconventional but surprisingly effective solution: build ships out of reinforced concrete.
As described in the Warfare History Network, these ships weren’t perfect – they were slower and heavier – but they got the job done. Some were used to transport cargo, while others became floating supply bases or even part of the artificial harbors used during the D-Day invasion.
The idea actually started as early as the 19th century in Europe, but it wasn’t until World War II that it was truly put to the test. The U.S. government commissioned over 20 large concrete ships, many of which saw active duty in both the Atlantic and Pacific theaters.
Some of these vessels are still visible today, repurposed as breakwaters or sunken reefs, quietly telling their story to anyone who knows where to look.
In this short YouTube documentary by Fluctus get a behind-the-scenes look at how these ships were built. It walks through the construction process and explains how concrete, typically associated with roads and buildings, was transformed into seaworthy vessels.
It’s an inspiring example of American ingenuity under pressure – and a testament to the builders and sailors who made it work.
At MEGASLAB®, we work with concrete every day. We know it as a strong, durable material – but seeing how it helped support our troops and allies during one of the most critical times in history gives it even deeper meaning.
This Memorial Day, we remember the lives lost in service. And we also reflect on the powerful ways that innovation – even with something as humble as concrete – can contribute to victory, peace, and progress.
To all who served, and to those we’ve lost — thank you. We honor your memory.
