Tetrahedron Beams Bernières-sur-Mer

Tetrahedrons are barred concrete beams. Six beams form four equilateral triangles. In wartime, composed of beams weighing 260 pounds each. It is a very strong construction and meant to stop landing craft on the beach. Sometimes a mine was placed on top of this barrier. The tetrahedrons along the coast are also called coastal tetrahedrons or concrete tetrahedrons. The Germans called it 'Betonsperre'.

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Source

• Text: TracesOfWar
• Photos: Koos Winkelman