Concrete cargo ships.

[DBII]

One of the many interesting items in the Houston area. In 1919 there was a shortage of steel. Twelve of twenty concrete ships was made. SS Selma was launched on June 28 1919, to late for the war. It was abandoned in 1922 when it it a jetty off Mexico. It was scuttled a mile off of Galveston.
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Two Historic Shipwrecks To Check Out Near Galveston | Houston Public Media

Wreckage of the SS Selma can still be seen above the water.

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[fubar57]

My hometown- Concrete Ships: The Powell River Floating Breakwater

 

[Maxrobot1]

They sank the USS Atlantus off of Cape May, N.J. and time has taken its toll. Not much remains after all those Atlantic storms.