Mariana snailfish The Mariana snailfish has been observed at depths of 8,178 metres – just over 5 miles down. The fish is named after its home, the Mariana Trench in the western Pacific Ocean, which is the deepest part of the world's seas.

In December 2014, a new species of snailfish was discovered at a depth of 8,145 m (26,722 ft), breaking the previous record for the deepest living fish seen on video. During the 2014 expedition, several new species were filmed, including huge amphipods known as supergiants.

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