Mariana Trench: Deepest ocean 'teems with microbes ... a recent study found this was a widespread problem, even for animals living in the deep. The dive forms part of the Five Deeps expedition ...

Narrator: The Mariana Trench is the deepest point on Earth ... Now, like lobsters, these animals have hard exoskeletons made of calcium carbonate, which you normally wouldn't find down here ...

Likewise, with the deep ocean, Don Walsh went to the bottom of the Mariana Trench and then for several ... Galathea expedition in 1951 trawled animals from more than 10km down.

Plastic pollution is an ever-pressing concern for the health of our ocean ecosystems and their inhabitants, with estimates of ...