What Lives in the Deepest Part of the Ocean?

0:00 What Lives 11,000 Metres Down 0:42 The Mariana Snailfish 2:54 The Supergiant Amphipods 5:20 A Single Cell the Size of Your Hand 7:12 What We're Still Finding 8:44 The Most Fragile Survivor 9:19 The Long Way Back Seven miles beneath the waves, the ocean doesn't end — it deepens, into trenches cut into the planet's crust. This is the hadal zone: 1,086 bar of pressure, two degrees, and total darkness. Nothing should be able to live here. Everything that does is a survivor against physics itself. We meet the Mariana snailfish (Pseudoliparis swirei) — a creature so soft you can see its organs through its skin, holding itself together with a single molecule. The supergiant amphipod (Alicella gigantea), the size of a loaf of bread, that we thought was rare until we realised it may live across half the seabed. Xenophyophores — single cells the size of your hand. And Dulcibella camanchaca, a hunter we only discovered in 2024. Of the entire deep seafloor, humans have laid eyes on less than a thousandth of one percent. Every dive still finds something new. This is the deepest stop on the descent through the ocean. Subscribe to @WhatOnEarth_YT #deepsea #marianatrench #oceanlife #documentary