Scientists have captured footage of a fish swimming more than 8km underwater, setting a new record for the deepest fish ever recorded. The animal, an unknown snailfish species belonging to the genus Pseudoliparis, was filmed at a depth of 8,336 metres in the Izu-Ogasawara trench, south-east of Japan. The footage was captured from an autonomous deep ocean vessel as part of a two-month expedition that began last year
