200 feet, the operational depth was probably 100 feet. However, it was noted that 'in an exceptional circumstance, one G boat dived to 170 feet when chased by mistake by British destroyers'.
During the First World War G7, G8 and G11 were lost on active. service through unknown causes and in September 1917 G9 was sunk in error by HMS Petard off the Norwegian coast. Of those that survived, four were taken out of service at the end of the war and the remaining six were withdrawn from service in January 1921.
The Nautilus 1913-1919
Nautilus was a bold experiment - with an increase in surface
