National Geographic : 1946 Dec
An Allied Landing Barge Ends Its Career by Becoming Part of Walcheren's Stronghold Against the Sea Obsolete British craft were towed into the gaps, loaded with dynamite, and sunk. These, and "beetles," or concrete pontoons (foreground), had tobeplaced and sunk in less than 30 minutes while low tide brought the water's flow to a standstill in the gap. Many German prisoners ofwar were used aslaborers. Lawrence Earl trom mlacK tar Weighted Down by Scrap Material and Sand, Old Barges Make a Firm Base for the New Sea Wall Here the tide is out and the gap is nearly closed, but water rushes from inside the new dike through the remaininghole. "Beetles" were brought from British "Mul berry" harbors, which had been towed across the Channel to help supply Allied soldiers on the Normandy beachhead.