Researchers from the University of Western Australia and Japan have plumbed the depths – five miles of depth – to spot and film the deepest fish ever seen. Using a remotely operated submersible in the Izu-Ogasawara Trench not far from Japan, the scientists spied a snailfish at a record-breaking 27,349 feet deep. The species is unknown, but it likely belongs to the genus Pseudoliparis.