Located in the Mariana Trench, over 6.7 miles beneath ... These microplastics not only harm marine ecosystems but also infiltrate the food chain, eventually affecting human health.

Narrator: The Mariana Trench is the deepest point on Earth ... Narrator: But if you put out some food, some of the planet's strangest creatures would emerge from the darkness.

China live-streamed footage of its new manned submersible parked at the bottom of the Mariana Trench on Friday, part of a historic mission into the deepest underwater valley on the planet.