SMS Kaiser primary salvage site splinter proof spotting top from forward mast
Scapa Flow in Orkney is the largest natural harbour and anchorage in Europe at 325 square kilometres in size, with sheltered waters that are mostly 20-60m deep. The Admiralty adopted it as the main base for the British Grand Fleet at the start of the First World War, to control the northern access to the North Sea and the Atlantic.
The Scuttling of the German High Seas fleet