Hadal definitions

hād'l
Of or relating to the deepest regions of the ocean, below about 6,000 meters (20,000 feet).
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Designating or of the ecological zone (hadal zone) of the ocean floor trenches below c. 19,685 ft (c. 6,000 m)
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Relating to the deepest regions of the ocean, below about 6,000 m (19,680 ft). The hadal zone mostly comprises trenches that can reach depths greater than 10,000 m (32,800 ft).
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Of, or relating to the deepest parts of the ocean.
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Origin of hadal

French from Hadès Hades from Greek Haidēs weid- in Indo-European roots