Events
On This Day - September 9
| 1907 | C12 | Launched |
| 1915 | J5 | Launched |
| 1915 | J6 | Launched |
| 1927 | Otway (N51) | Completed |
| 1939 | Ursula (N59) | British HMS Ursula fired the first British submarine torpedoes of the war when attacking German U-35. The U-boat escaped |
| 1943 | Welman 10 | Midget submarine "Welman 10" alongside depot ship HMS Forth. The commander (Lt B Pedersen of the Norwegian Army) makes an unaided escape to the surface. There are no casualties |
| 1943 | Rorqual (N74) | HMS Rorqual lays 15 mines off Trikeri, Greece. |