Deep Ocean: Giants of the Antarctic Deep

Each home has a built in pool or water tank that lies partly inside, partly outside its’ walls… A continuous stream of spring water is piped right into a basin, so freshwater is always available. People rinse out pots in the tank and clean their freshly picked vegetables. If they simply pour the food scraps back in the water, they risk polluting the whole village supply. However, carp can scour out even the greasy or burnt pans. They do the washing up in Satoyama villages. This traditional arrangement is called the riverside method. It’s used all over Japan. Cleaned up by the carp, the tank water eventually rejoins the channel.

The deep waters of the Southern and Pacific Oceans still hold many mysteries. Two international teams of scientists set out to explore the icy depths of Antarctica and the abysses of the Mariana Trench. Filmed for the first time, creatures seemingly from another galaxy cohabit with champions of survival in extreme conditions.

Natural World is a nature documentary television series broadcast annually on BBC Two and regarded by the BBC as its flagship natural history brand. It is currently the longest-running series in its genre on British television, with more than 400 episodes broadcast since its inception in 1983. Natural World is produced by the BBC Natural History Unit in Bristol, but individual programmes can be in-house productions, collaborative productions with other broadcasters or films made and distributed by independent production companies and purchased by the BBC. Natural World programmes are often broadcast as PBS Nature episodes in the USA. Since 2008, most Natural World programmes have been shot and broadcast in high definition.

Japan is a country of steep mountains surrounding wide flat plains where people have lived for thousands of years. On the largest plain lies the country's largest freshwater lake, Lake Biwa, which is not at all far from Japan's ancient, capital city of Kyoto. The slopes that stretch down towards the lake have been terraced. Here rice seedlings need shallow water in which to grow, and the neat, meticulously constructed paddy fields provide just this. Some of them have been cultivated continuously for thousands of years. Alongside them stand patches of woodland where, for centuries, the people have found their fuel and their food. This is a land that has been touched by people, yet the people tread lightly upon it. It's a land that has been ruled for centuries by the demands of the rice, yet it's still dominated by the rhythmic cycle of the seasons. Here is a landscape that the Japanese people hold so close to their hearts that they have a special word for it: Satoyama.