Deep-sea fish adapt to some of the most extreme conditions on Earth. New research analyzing their evolution finds the same mutation across fish species that have evolved on separate timelines — ...

Narrator: The Mariana Trench is the deepest point on Earth ... The Mariana snailfish, aka the deepest fish ever discovered, which scientists have seen more than 8,000 meters down.

In a groundbreaking scientific expedition, researchers have identified over 7,000 new microbial species thriving in the depths of the Mariana Trench, the deepest point in the world’s oceans.

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