Working with scientists from the Nekton mission we will use small submarines to descend past coral gardens into the dimly lit and little explored ‘twilight zone’ at a depth of 300m (984ft).

The three one-hour programmes in the Deep Ocean Live series will use pioneering technology to beam live pictures up to the surface.

The dives, announced on the second anniversary of the Sky Ocean Rescue campaign, will take place around Aldabra, one of the world’s largest and most remote coral atolls, 600 miles southwest of the Seychelles.

The island is known as the “Galapagos of the Indian Ocean” because it has so many endemic species. The large number of sharks and other predators in the area are a sign of a healthy reef.

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