British seaplane probably destroyed enemy submarine on 25 June 1917

In the meeting of the British War Cabinet on Tuesday 26 June 1917 reported the First Sea Lord that a seaplane attacked on 25 June an enemy submarine about 8 miles north of Cape Cornwall In the meeting of the British War Cabinet on Tuesday 26 June 1917 reported the First Sea Lord and dropped 3-100 lbs bombs and shotly afterwards was a large upheaval observed..(1)

Note

1. Sir John Jellicoe (5 December 1959 Southampton, England-20 November 1935 Kensington, London, England), Admiral of the Fleet, First Sea Lord 30 November 1916-10 January 1918.

Source

The National Archives, Kew Gardens, England CAB 37-23-3-17