Admiralty scaffolding

Admiralty scaffolding, also known as Obstacle Z.1, or sometimes simply as beach scaffolding or anti-tank scaffolding, was a British anti-tank and anti-boat obstacle design made of tubular steel. It was widely deployed on the beaches of southern England, eastern England and South West England during the British anti-invasion preparations of World War II, though scaffolding was also used, but more sparingly, inland.