Ships in North Sea
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Hunting submarines in the North Sea

Nato has been conducting its largest ever anti-submarine warfare exercise in the North Sea, off the coast of Norway.

It is seen as a response to the growing threat from Russian submarines which have stepped up their own patrols.

There have been recent reports of Russian activity off the coast of Scotland, Sweden and Finland.

Jonathan Beale reports.

  • 14 May 2015
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