When submerged, submarines may be subject to enemy action, mechanical failure, collision and other accidents that mean it is immobilised and unable to surface. Escape and Rescue are key capabilities.
In 1939, the Royal Navy suffered a very high number of casualties from HMS Thetis, the first video sets the scene for submarine rescue, sobering stuff. HMS Affray was the last British submarine casualty, in 1951. The second video shows the state of the art nearly 50 years ago. The Historic Naval Ships Association has a good page on Escape Procedures from the O Class Submarines, click here to view.
There was also the well known Russian submarine loss, the Kursk.
This is a look at Royal Navy and NATO rescue and escape capabilities
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