26 July 2012 Last updated at 12:20 ET

Diver rescued from disused Dorothea Quarry in Snowdonia

Dorothea Quarry There have been more than 20 fatal accidents at the flooded Dorothea quarry since 1990

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A diver has been airlifted to a decompression chamber after surfacing from a 300ft (91m) deep pool at a disused quarry in Snowdonia.

The 24-year-old man was at the the flooded Dorothea Quarry in the Nantlle Valley, a popular diving site.

He was taken by an RAF Sea King helicopter to a private Wirral hospital which has a decompression chamber.

It is understood the diver is suffering from decompression sickness, also known as the bends.

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