Events

1905	A4	Whilst carrying out sound signal experiments at Spithead, HMS A4 was trimming down when water came through a ventilator being used to signal, with a flag on a boathook, the results of the sound tests. The submarine went down to 90 feet with an inclination of 40 degrees by the bow. Due to the contact with seawater, chlorine gas started escaping from the batteries. The Captain ordered all ballast tanks blown and as soon as the submarine surfaced, the crew were ordered on deck. An explosion occurred as the boat was being towed to the dock and she slowly sank. She was later salved and put back into service.
1917	L56	Laid Down
1940	Tigris (N63)	HMS Tigris sinks the French fishing vessel Cimcour with gunfire in the Bay of Biscay.
1940	P552	Recommissioned
1943	Torbay (N79)	HMS Torbay torpedoes and sinks the German troopship Kari and torpedoes and damages the Italian merchant (in German service) Trapani east of Naxos, Greece.
1944	Vengeful (P86)	Completed
1971	Courageous (S50)	Completed

RN Subs

The Loss of Submarine A3	Read
Submarine A3 was sunk as a result of a collision with HMS Hazard on 2nd Feb 1912 during trials in the Solent. All members of the crew were lost. The Submarine was raised and the bodies of the crew recovered. They were buried, later, in the Haslar Royal Naval Cemetery.