The Incredible Secret World at The Bottom of The Sea !

In a year-long mission, a BBC team probed a small part of the earth's amazing undersea world. They completed 1000 dives and explored seven different oceans across the globe. What they found was extraordinary...

Early sightings of a dugong, or sea cow, were probably responsible for the myth of the mermaids. But their numbers are declining rapidly. The expedition headed to the Bazaruto archipelago, nine miles off the coast of Mozambique, to investigate the very last sustainable population of dugongs - which are related to elephants - in the western Indian Ocean.

One of the team's divers observes a shoal of jacks circling with balletic precision. This behaviour is a source of much debate, but is thought to be a defence mechanism against predators.

A giant manta ray, known to have the biggest brains of all fish, spotted off the south coast of Mozambique. In the background lurks a shark.

Paul Rose explores the wreck of the Paraportiani, a cargo ship that sank off the coast of East Africa in 1967.

None of the dive team had ever seen a weedy sea dragon, found only in kelp forests. But Philippe Cousteau and Tooni Mahto struck lucky at Fortescue Bay, on the east coast of Tasmania.

Despite the size of male sperm whales - which can reach up to 16 metres in length - sightings are rare. But when you see one, it's worth the wait.

Sea coral grows in abundance on the sheer, underwater cliffs of the reef at the island of Pemba, 50 miles off the coast of East Africa and one of the three islands off Tanzania, along with Zanzibar and Mafia island.

Huge sunfish are indigenous to the Sea of Cortez, a strip between the Baja California peninsula and mainland Mexico, 60-130 miles wide and 995 miles long. These giants can grow up to six metres long.

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