'Underwater Pyramid' Discovered Off The French Coast

EnolaGaia

I knew the job was dangerous when I took it ...
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The article states it is 3-sided ( "Elle possède trois faces lisses")
This shape doesn't exclude the possibility the object was a WW2-era beach defense obstacle.

There was a mass-produced and commonly deployed variation on the Czech Hedgehog consisting of steel beams welded into a tetrahedral structure which was often coated in concrete. The tetrahedral shape provides 3 faces intersecting at each vertex.

This obstacle type was called a 'Tetrahydra'.

Here's a photo of 3 such Tetrahydras removed from the D-Day beaches.

34ae23ae17a9167f0c27a2104b722381f9a99d77.jpg

As was the case for other defensive obstacles, there were variants.
 
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