hadal zone

American  

[hay-duhl zohn] / ˈheɪ dəl ˈzoʊn /

noun

1. the deepest region of the ocean, which is found within ocean trenches and begins at depths greater than about 6,000 m (19,680 ft).

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Example Sentences

Finally, there are the incredibly deep seafloor trenches known as the hadal zone, named after Hades, Greek god of the underworld.

From Scientific American • Aug. 6, 2022

Since then, Dr Cui has set his eyes on the hadal zone in general, and in particular on the bottom of the Mariana trench.

From Economist • Aug. 25, 2016

The hadal zone is one of the most poorly studied habitats on Earth.

From Nature • Mar. 17, 2016

Among other things, the institute hoped to use the robot, which was a ‘hybrid’ capable of being controlled remotely and operating autonomously, to investigate the ocean’s hadal zone.

From Nature • Dec. 8, 2015

Nereus was lost during only its second mission in the hadal zone.

From BBC • Jul. 16, 2014