The team carry out pioneering science on one of the largest carnivores on Earth: the 20-metre-long sperm whale; exploration of a sunken ship with a tragic human story; the search for evidence that the Sea of Cortez is still growing.

The team investigate why parts of the Southern Ocean are warming twice as fast as the rest of the world's oceans. They also go in search of the weedy sea dragon and explore kelp forests to investigate what threatens them.

The team explore the remote Southern Red Sea, teeming with marine life and home to some of the warmest waters on the planet. With unique access, the team investigate whether the coral here can help other coral reefs threatened by global warming.

The Atlantic Ocean is the youngest of the great oceans and critical in influencing the climate. The team make a dangerous dive into a `black hole' to discover how different the planet's earliest oceans were 3.5 billion years ago.

The team investigate how schools of manta ray suffering from shark bites are treated by the inhabitants of a remarkable reef, and they go in search of one of the Indian Ocean's most elusive creatures, the dugong.

The team explore the coastal waters of the Indian Ocean to discover what happens when its power collides with the edge of a continent. They search for one of the ocean's most mysterious creatures: the seahorse.