19 December 2014 Last updated at 01:01
By Rebecca Morelle
Science Correspondent, BBC News, San Francisco
A new record has been set for the world's deepest fish.
The bizarre-looking creature, which is new to science, was filmed 8,145m beneath the waves, beating the previous depth record by nearly 500m.
Several other new species of fish were also caught on camera, as well as huge crustaceans called supergiants.
The animals were discovered during an international expedition to the Mariana Trench, which lies almost 11km down in the Pacific Ocean.
The 30-day voyage took place from the Schmidt Ocean Institute's research vessel, Falkor, and is the most comprehensive survey of world's deepest place ever undertaken.
The Hadal Ecosystem Studies (Hades) team deployed unmanned landers more than 90 times to depths that ranged between 5,000m and 10,600m. They studied both steep walls of the undersea canyon.
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