On 22 June 1917 at 0500, Sub Lt M S Graham was washed overboard from the bridge of HMS G8 (Lt G F Tryon) whilst the submarine was hove to in a storm near the northern tip of the Shetlands. The subsequent search failed to find him.

HMS G8 sailed from the Tees on 27 December 1917 escorted by the destroyer HMS MEDEA. Her patrol orders were to search for 2 German armed steamships and a Torpedo Boat that had been reported east of Hessele in the Kattegat.

G8 was sent a signal recalling her to base on 3 January 1918 but did not returned as expected on 6 January, was reported overdue on 8 January, and was officially declared missing on 14 January.  This date persists on ADM104-140 to ADM104-149 “Reports of Dead and Wounded” . It appears that, unusually, and for no obvious reason, the official date of death for the whole crew was changed in manuscript to 3 January 1918 on the original ADM104-125-1 to ADM104-125-3 “Death Register” and on individual Service Certificates.

It was assumed that G8 struck a mine in the North Sea and was lost with all hands. However, in 2019 a wreck was found and verified as G8 at a depth of 100m (330ft) in the Skaggerak North of Hirtshals with no apparent damage to the hull and planes set at rise angles. The exact date and cause of loss is unknown.