While his peers have all turned white, Katak is still small and grey. To prove that he has grown up and to grant the last wish of his adored grandma, Katak departs on a perilous journey to the Great North.

Supported by the National Geographic Society, the world's eminent blue whale scientists embark on a revolutionary mission: They'll find, identify, and tag California blue whales, use the DNA samples to confirm the sex of individual whales, then rejoin the massive creatures' stunning migration when they collect at a chimera known as the Costa Rica Dome.

The story of a little loggerhead turtle, as she follows in the path of her ancestors on one of the most extraordinary journeys in the natural world. Born on a beach in Florida, she rides the Gulf Stream up towards the Arctic and ultimately swims around the entire North Atlantic across to Africa and back to the beach where she was born. But the odds are stacked against her; just one in ten thousand turtles survive the journey.

Soviet cosmonauts land on the planet Venus and find it teeming with life, some of it dangerous.

THE LONELIEST WHALE is a cinematic quest to find the “52 Hertz Whale,” which scientists believe has spent its entire life in solitude calling out at a frequency that is different from any other whale. As the film embarks on this engrossing journey, audiences will explore what this whale’s lonely plight can teach us — not just about our changing relationship to the oceans, but to each other. Executive Produced with Leonardo DiCaprio and Adrian Grenier.

Shot on the Great Barrier Reef in Australia and in the Bahamas, Ocean Wonderland brings to you the amazing beauty of the many varieties of coral and the immense diversity of the marine life thriving there.

A biographical documentary about the Belgian free-diver Fred Buyle and his art of silent diving.

Jellyfish blooms are making headlines around the world. This is due to the damage they cause to tourism, fishing and our health. How can these creatures, which are over 98% water and have no shell, skeleton or brain, expand so rapidly? Although this is a normal stage in the life cycle of these gelatinous animals, we have to admit that blooms have become much more frequent and massive in recent decades. We're even witnessing jellyfish populations appearing in more and more regions where fish have been replaced by them, such as off the coast of Namibia, in the Black Sea, in the Sea of Japan and in certain areas of the Baltic Sea. What causes this? Why has the role of jellyfish in the ocean been underestimated, even though they outlived the dinosaurs? Are jellyfish on their way to dominating the oceans as they once did? What if they were to be the only ones left?

Researchers investigate whether orcas have begun hunting great white sharks off the coast of New Zealand.

A clash of true oceanic titans sees fights in the remote battlefields of Ascension Island. Tuna are often faster, fitter and bigger than the sharks.

A routine drone survey turns deadly when Ryan Johnson, a marine biologist based in South Africa, films a humpback whale being attacked and strategically drowned by a Great white shark. This is a total perspective shift for the creature.

Three great whites are spotted in the waters off Oahu, but another one could be lurking just below the surface.