The deep sea, which gets darker with increasing depth until no more sunlight penetrates at about a kilometer depth, and ever colder closer to the bottom of the ocean, covers most of the planet and is thus by far the largest habitat on earth, yet has been explored less than space, so most scientific expeditions, at depths requiring modern submarine technology, discover at least one new species, or even whole new branches of submarine life. Like everywhere else, evolution has over millions of years produced several amazing adaptations to even the most extreme conditions...
Endless blue stretches in every direction. The sea bed is a staggering eight kilometers deeper down and the nearest island is 500 kilometers away. There is nothing save the burning sun above and the blackened abyss below. How, then, does life exist?
Life on the edge of a frozen sea is tough. Ice at both poles is constantly moving, and in winter freezes solid with air temperatures 70 °C below freezing. Only in spring, with the retreating ice and light reaching the water, does life begin again.
Coral reefs are the rainforests of the sea; fish compete for food, territory and mates within this oasis of life. Incredible time-lapse photography shows the dramatic formation of a coral reef, portraying its inhabitants and its ultimate destruction.
Tidal marshes are one of the most productive parts of the world. Numerous plants support numerous animals, yet life is not easy: predators are attracted to these enormous quantities of food, forcing animals to seek constant protection from attack.
For years man has ploughed the ocean in search of food and riches, but now we may be about to use this valuable asset, such is the intolerable strain we have inflicted. Deep Trouble is presented by Martha Holmes.
The program takes a fascinating behind-the-scenes look at the making of this epic series. High adventure and stunning wildlife are combined with intimate, and at times emotional, studies of the characters who bought it to the screen.