The Orkney archipelago, off the north coast of Scotland, in Britain, forms a safe natural harbour - Scapa Flow. Home to the great Northern Fleet in WW1 and WW2, many of these hauntingly beautiful concrete structures still stand, albeit now in a dangerous condition. There are many scuttled ships - some the original blockships, sunk between the islands in an attempt to prevent Uboats entering Scapa Flow, and some deliberately sunk ships of the captured German fleet. These are now considered world class dive sites.
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