The Deep Ocean: From Sunlight to the Deepest Point | 4K Documentary

A calm 4K deep ocean documentary: one slow descent through every layer of the sea, from the sunlit reef to the Challenger Deep, nearly eleven kilometres down. How does life survive in a world that sunlight never reaches? In this film you will discover: • Why red is the first colour to vanish underwater, and why so many deep-sea animals are red • The twilight zone, which may hold more fish than all the rest of the ocean put together • The largest regular migration on Earth: roughly 10 billion tons of animals rising and sinking every day • Why about three quarters of the animals recorded in the deep water column can make their own light • Marine snow, whale falls and the slow food chain of the abyss • The Challenger Deep: deeper than Mount Everest is tall, and reached by fewer than thirty people Chapters 00:00 The sunlit surface 6:40 The sunlight zone: a world of colour 13:36 The twilight zone 20:21 Living light 27:17 The midnight zone and the abyss 34:05 The Challenger Deep 40:48 Return to the light