The University of Hawaii's Jeff Drazen and Patty Fryer led the international team's 30-day expedition into the Mariana Trench, which was part of a program aimed at studying the deepest parts of the ocean, known as the Hadal Ecosystem Studies (HADES). To capture videos and survey the trench, the team deployed a Hadal Lander, which spotted the ghastly snailfish with its camera. But that wasn't the team's only discovery. Researchers also observed a supergiant amphipod and a new snailfish species. If you want to explore some more historical trench discoveries, you can try out this handy timeline.