Oceans

The team dives beneath the polar ice cap to explore how it is shrinking and how that change could affect the rest of the world. They collect samples of tiny creatures at the base of the Arctic Ocean's complex food chain.

The team explores how human activity is threatening to destroy the Mediterranean Sea. They dive to a Roman shipwreck and explore a perilous network of submerged caves to look for evidence of the changes to the sea.

In the coastal waters of the Indian Ocean, the team searches for seahorses and dives in search of the sunken remains of a medieval village that was dragged into the sea by a cyclone.

In the rich, tropical waters of the Indian Ocean, the team investigates how schools of manta rays suffering from shark bites are treated by the inhabitants of a remarkable coral reef, and they go in search of the elusive dugong.

In their exploration of the Atlantic Ocean, the team dives into a black hole near the Bahamas to discover what the oceans were like billions of years ago. They also brave waters teeming with sharks to test a shark repellent.

The team visits the remote and unexplored Southern Red Sea, which is teeming with marine life and home to some of the warmest waters on the planet. It may hold the key to the future health of coral in the face of global warming.

The team braves rough seas and strong winds to investigate the impact of warming in parts of the Southern Ocean, also known as the Antarctic Ocean.

The team explores the threat to the Sea of Cortez, a unique ocean paradise off the coast of Mexico that is home to the greatest variety of whales and dolphins in the world. They study giant squid, sharks and sperm whales.