Letter from Vice-Admiral Sir John Jellicoe [Commander- in-Chief of the Grand Fleet] (HMS Iron Duke) to WSC, First Lord of the Admiralty, on subjects including the submarine threat to the Fleet. Jellicoe reports rumours that a periscope had been sighted inside Scapa Flow [Orkney Islands, Scotland], and that although this had proved false, the risk from submarines and torpedo boat destroyers was very real. He states that he dare not keep Dreadnoughts there at night and also comments on the need for a secure base on the West Coast.