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Scapa Flow in Orkney was used as the home port for the British Fleet during both World Wars. At the end of World War 1, the German fleet was brought here and scuttled to dispose of the ships and to create a barrier preventing access to the harbour from the East. More ships were scuttled between the wars, and during World War 2, although many of the German ships were raised from the sea bed and taken to Rosyth for salvaging. Also during World War 2, a German U-boat managed to make its way through the harbour defences and sink the Royal Oak. This prompted the British to create what are now known as the Churchill Barriers - a series of four concrete barriers between the south islands. You can drive over the barriers from Mainland Orkney all the way to South Ronaldsay and will actually see wrecked ships on either side as you cross them.