Episode list

The team explore how a unique ocean paradise, home to the greatest variety of whales and dolphins in the world, is under threat. They dive in stormy seas to investigate how a giant predator, the cannibalistic Humboldt squid, is invading this sea, and search for the threatened hammerhead shark.

Parts of the Southern Ocean are warming twice as fast as the rest of the world's oceans. The team brave some of the roughest seas and the strongest winds on the planet as they investigate this phenomenon. They also dive one of the thousand shipwrecks in these waters and in a unique sunken valley they search for mysterious deep ocean creatures normally found hundreds of metres below the surface.

The team explores the remote and unexplored Southern Red Sea, teeming with marine life.

The Atlantic Ocean is the youngest of the great oceans and critical in influencing our climate. The team dive into a 'black hole' to discover how different our planet's earliest oceans were 3.5 billion years ago. They also brave waters teeming with sharks to act as human bait in an experiment to test a shark repellent.

In the first of two episodes in the rich tropical waters of the Indian Ocean, the team investigate how schools of Manta Ray suffering from shark bites are treated by the inhabitants of a remarkable reef. They go in search of one of the Indian Ocean's most elusive creatures, the dugong, and visit a 'coral nursery'.

In the coastal waters of the Indian Ocean the team search for one of the ocean's most mysterious creatures, the seahorse, to see how the population is fairing amid increasing demand from the eastern medicine market. They dive in search of the sunken remains of a medieval village, dragged into the sea by a cyclone, and take part in an experiment to help protect whale sharks.

An exploration of the profound effect that man is having on the Mediterranean Sea.

The team dives beneath the polar ice cap to explore how the ice is shrinking.