Mulberry Harbors - Artificial Ports Won Normandy

The Allies towed 115 massive concrete caissons weighing up to 6,000 tons across the English Channel. Sunk to create breakwaters with floating roadways that flexed with tides. Mulberry A at Omaha was destroyed by a storm June 19. Mulberry B at Arromanches operated 10 months, unloading 2.5 million men, 500,000 vehicles, and 4 million tons of supplies. Remnants still visible today.