Submarines in Home Waters.
Patrol Flotillas.
1st Flotilla. Devonport.
Depôt ship: Onyx.
Submarines: A.8 and A.9.
2nd Flotilla. Portsmouth.
Depôt ship: Dolphin.
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.
Submarines: C.1, C.2, C.3, C.4, C.5, C.6.
6th Flotilla. Chatham.
Depôt ships: Bonaventure and Hebe.
Submarines: C.7, C.8, C.9, C.10, C.12, C.13.
7th Flotilla. Chatham.
Depôt ships: Vulcan and Alecto.
Submarines: C.19, C.20, C.21, C.22, C.23, C.24, C.25, C.26, C.27, C.28, C.29, C.30.
8th Flotilla. Portsmouth.
Depôt ships: Maidstone and Adamant.
Submarines: D.1, D.2, D.3, D.4, D.5, D.6, D.7, D.8, E.1, E.2, E.3, E.4, E.5, E.6, E.7, E.8, E.9.
9th Flotilla. Devonport.
Depôt ship: Pactolus.
Submarines: A.10, A.11, A.12.