Submarines: A.5, A.6, A.13 and B.1.
3rd Flotilla. Devonport.
Depôt ship: Forth.
Submarines: B.3, B.4, B.5, C.14,
C.15 and C.16.
4th Flotilla. Portsmouth.
Depôt ships: Arrogant and Hazard.
Submarines: C.17, C.18, C.31, C.32, C.33, C.34, C.35.
5th Flotilla. Chatham.
Depôt ship: Thames.