SUBMARINES: CHATHAM BUILT
| List of Commanding Officers up to 1973 | |
| Lt Cmd | N.H. Frawley |
| Lt Cmd | C.J. Crow |
| Lt Cmd | H.R Waddell |
| Cmd | M. Tate |
| Lt Cmd | C.E. Falstrem |
HM Submarine Okanagan
Okanagan was laid down on 25 March 1965. She was launched on 12 September 1966 by Madame Monique Cadieux,
wife of the Associate Minister of National Defence Canada the Hon. Leo Cadieux.
At the launch march past, Rear Admiral W.J. Parker took the salute and both the Royal Marine band and the Canadian band were on parade.
8.000 people were at the dockyard for the ceremony.
The history of this submarine is still being researched.