What's REALLY at the Bottom of the Ocean?

We have better maps of the surface of Mars than we do of our own ocean floor. More than eighty percent of Earth's ocean has never been seen by human eyes. So let's do what almost no one ever does — go all the way down. From the sunlit reefs, through the glowing twilight zone and the pitch-black midnight zone, past hydrothermal vents where life runs on chemistry instead of sunlight, into the hadal trenches — all the way to the Challenger Deep, nearly 11,000 meters down. Along the way: the WWII sonar mystery of the "false seafloor", fish that outnumber every other vertebrate on Earth, a 45-meter animal, whales hunting squid in total darkness, ecosystems that rewrote what life needs to exist — and the unsettling thing scientists found in the guts of creatures at the very bottom of the world. The strangest alien world we've ever found isn't out there. It's right here, beneath the waves. Chapters: 0:00 Better maps of Mars than our ocean 0:27 The sunlight zone 1:09 Into the twilight zone 1:24 The WWII sonar mystery 2:11 A glowing world (bioluminescence) 2:44 The midnight zone 3:12 Gulper eels, giant squid & sperm whales 4:09 The abyssal plain & deep-sea mining 4:42 Hydrothermal vents — life without sunlight 5:27 The hadal zone 6:10 The Challenger Deep 6:40 1960: two men at the bottom of the world 7:18 What we found down there 7:47 More unknown than known An educational deep-dive for the curious. #ocean #deepsea #marianatrench #science #nature