Sea of Cortez: A team of marine experts reveal the hidden stories of our planet's last true wilderness - its oceans. Find out why the predatory Humboldt squid is invading the sea. [S]
Southern Ocean: The team go in search of the weedy sea dragon and investigate why parts of the Southern Ocean are warming much faster than other oceans. [S]
Red Sea: Marine experts unearth the mysteries of the world's oceans. The largely unexplored Southern Red Sea is full of marine life and home to some of the warmest waters on the globe. [S]
Atlantic Ocean: Discover the magical mysteries of the deep with a team of marine experts. Here, they make a perilous dive into a 'black hole' to see how different the earliest oceans were. [S]
Mozambique: In the first of two episodes on the Indian Ocean's stunning tropical waters, we explore its remote underwater worlds and visit a coral nursery in search of the elusive dugong. [S]
Coastal Waves: Marine experts reveal the mysteries of the deep in the Indian Ocean's coastal waters. See what happens when this powerful ocean collides with the edge of a continent. [S]
Mediterranean: Marine experts reveal the hidden stories of our planet's last true wildernesses. Hear about the profound effect that mankind is having on the Mediterranean Sea. [S]
Arctic: Marine experts explore the mysteries of the world's oceans. In the Arctic, they dive beneath a polar ice cap to look at how the ice is shrinking and how this could affect climate. [S]