RN Submarines - On this date April 29th

1912	Maidstone	Depot Ship HMS Maidstone launched
1942	Sibyl	Submarine HMS Sibyl launched
1942	Varne	Submarine HMS Varne laid down
1942	Vox	Submarine HMS Vox laid down
1940	HMS Unity	At 1730 HMS Unity sailed from Blyth to patrol off Norway. The visibility was down to 300 yards as Unity moved out in the main channel, where the Norwegian ship Atle Jarl was proceeding on her way from Scotland to the Tyne A short while later visibility was down to 100 yards and neither vessel was aware of the other until the submarine spotted the ship at 50 yards and on a collision course. There was just time to shut the bulkhead doors and order the engines astern before the Atle Jarl smashed into the submarine. The order to abandon the submarine was given and Unity sank only five minutes after the collision
1942	Urge	Reported lost whilst on passage from Malta to Alexandria on 29th April 1942. At the time of the loss the submarine was carrying ten ratings as passengers in addition to the normal crew as part of the evacuation of the 10th Submarine Flotilla from Malta to Alexandria.
1943	Unshaken	HMS Unshaken fires four torpedoes against the French passenger/cargo ship Cap Corse off Cape San Vito, Sicily, Italy. All torpedoes missed.
1944	HMS Tantalus	HMS Tantalus sinks the Malaysian Pulo Salanama with gunfire in Malacca Strait.
1945	HMS Tradewind	HMS Tradewind torpedoes and sinks the Japanese merchant tanker Takasago Maru in the Gulf of Siam.  Thanks to Barrow Submariners Association