Sarah Rainsford aboard a US submarine rescue vehicle (BBC video)The world's largest submarine rescue exercise is underway off the coast of Spain, with a Russian submarine taking part for the first time in such a NATO drill. The BBC's Sarah Rainsford was given rare access to ride an American rescue vehicle to the bottom of the Mediterranean sea.
  • Sarah Rainsford aboard a US submarine rescue vehicle (BBC video)

  • B-871 'Alrosa' (Photo: Andrew Butko)

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