WIREDGOV

Costing £130m and weighing 360 tonnes, the NATO Submarine Rescue System is one of the most sophisticated pieces of equipment in the world. For four days, 70 experts from three countries put it through its paces.

The NATO Submarine Rescue System (NSRS) is stored and maintained in a giant purpose-built hangar at HM Naval Base Clyde. It is so sophisticated that it can dive to 2,000 feet (610m) - deep enough to operate anywhere around the world's continental shelves.

Owned by Britain, France and Norway, it is always on standby - and happily, so far, it has never been used.

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