Most known as "Anti-Invasion" Spikes, they have been hidden during 75 years, but coastal erosion has revealed the hazardous and scaffold-like structures, which were installed to hinder German troops in the event of an invasion. Operation Sea Lion was Nazi Germany's plan to invade the United Kingdom during the Second World War, following the Fall of France, Belgium, Luxemburg and Low Countries in 1940. 

More remains of the metalwork are being uncovered by the sea at a rapid rate [Via] 

The British engaged upon an extensive programme of field fortification. The rapid construction of field fortifications transformed much of the United Kingdom, especially southern England, into a prepared battlefield. The German invasion plan, Operation Sea Lion, was never taken beyond the preliminary assembly of forces. Today, little remains of Britain's anti-invasion preparations.

Jagged metalwork is on the seabed just below the waterline. Scaffold-like structures were installed on Hordle beach, near Lymington, Hampshire. The line of spiked metal trellis was placed in the sea along the New Forest's coast by the Wiltshire Regiment at the height of the war in 1940-41. It was designed to thwart invading troops and their landing craft, Daily Mail Online, reports.

There are also known to be remains of other wartime metal and concrete structures in the sea to the east of Barton beach.

Steve Cook, Coastal engineering manager, said: “This metalwork has been surfacing on the seabed regularly due to erosion of the beach over the decades. As it’s below the tide line we’ll have to wait until August, when very low tides will allow us to get heavy machinery close enough to the metalwork to remove it. Even then we’ll only have about a two-hour window of shallow water to work in at each low tide.”

On the other hand, A council spokesman said: “Unfortunately within two tides of being installed it had sunk into the sea bed by 16 inches. Work to dismantle the defences began as early as 1949, by which time they had sunk by several feet. Over the decades much of the structure disappeared below the sea bed, but constant coastal erosion causes new sections to reappear each year. For the last eight years the council has been removing them as they emerge, including removing five tonnes earlier this year. Following the latest discovery the council is strongly advising people against swimming anywhere in the area around or between the buoys at Hordle beach until the hazard has been removed.”

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