The small channel of water, which is busy with huge cargo ships entering and leaving the Mediterranean, is rarely dived but Rory Moore, 28, a British marine biologist, and his fellow free-divers were granted permits.

Mr Moore, from Crickhowell, Wales, said: "Some of the whales came up to the camera and started to blow bubbles and 'bark' loudly. It was an amazing thing to witness but it was actually a clear sign to keep our distance.

To read the full story, click here.