Russians join Nato submarine rescue drill

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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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