剧情简介:This episode explores the unknown depths of the ocean. Over 60% of the sea is more than a mile deep and it forms the planet's most mysterious habitat.... A sperm whale descends 1,000 metres to look for food and is followed, with the Johnson Sealink submersible. On the way down, a number of unusual creatures are witnessed, such as transparent squid and jellies, whose photophores give pulsating displays of colour. In such dark places, both being able to see (or sense movement) and the means of quick concealment are equally desirable. To that end, some use bioluminescence as a means of detecting food or evading predators. A descent to the very bottom of the ocean — some 4,000 metres — reveals life even at such cold temperatures, much of it new to science. It is dominated by echinoderms that sweep the sea bed; however, there are occasional large hunters, such as chimaera. In addition, sixgill sharks can grow up to eight metres in length and have remained unchanged for 150 million years. They are described as "living fossils" and relatively little is known about them. The remains of a gray whale are filmed being consumed by hagfish, a sleeper shark, probably a Greenland sleeper or a Pacific sleeper and the submersible involved in filming this is DSV Alvin, which is the same submersible that Robert Ballard used in 1986 to explore the wreck of the Titanic, as acrylic sphere submersibles cannot reach that depth. As the continental slope flattens out, it joins the abyssal plain, which can form huge trenches. At seven miles, the deepest is the Mariana trench, and fish have been found there right down to the very bottom. Attenborough remarks that more is known about the surface of the moon. Species captured on film for the first time include the Dumbo octopus and the hairy anglerfish.
This episode was nominated for two Emmy Award for Outstanding Sound Editing and Outstanding Sound Mixing in the non-fiction category. It was also nominated for a BAFTA TV award for Best Innovation.更多»