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The incredible 20 MILE chalk reef, which is teaming with colourful fish, plants and wildlife, has remained hidden under the North Sea for 300 million years.
The amazing natural phenomenon, which lies just half a mile from the shore, features massive two-metre high rock arches and deep gullies where the water has worn away the chalk.
The team of amateur volunteer divers came across the remarkable rocky plain - a mere eight metres under the sea - when they were surveying the area.