Russians join Nato submarine rescue drill


The world's largest submarine rescue exercise, involving more than 20 nations and 2,000 people, is under way off the coast of Spain.

For the first time ever, a Russian submarine is taking part in the exercise, carrying out test dockings with Nato rescue vehicles.

The BBC's Sarah Rainsford was given rare access to an American rescue module on a journey to the bottom of the sea and the Russian submarine, the Alrosa.

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