Narrator: The Mariana Trench is the deepest point on Earth ... the pressure is so great and the temperature is so low that calcium carbonate dissolves. But these amphipods have a secret weapon.

Scientists sampled fish living in the Pacific's Mariana Trench and trenches in the Indian Ocean. . | Credit: Han Xu et al. (2025) Evolution and genetic adaptation of fishes to the deep sea.

Manned submersibles capable of reaching full-ocean depth have been rare, with less than a dozen individuals visiting the ...

The first explorers visited the trench in 1960 on a brief expedition, after which there had been no missions until Hollywood director James Cameron made the first solo trip to the bottom in 2012.