aphotic zone

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aphotic zone:

see oceanocean,
interconnected mass of saltwater covering 70.78% of the surface of the earth, often called the world ocean. It is subdivided into four (or five) major units that are separated from each other in most cases by the continental masses. See also oceanography.
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aphotic zone

[a′fäd·ik ‚zōn]
(oceanography)
The deeper part of the ocean where sunlight is absent.
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References in periodicals archive ?
The region below this is known as the aphotic (no-light) zone, but this is only true for sunlight, as bioluminescence is common.
First prize in the conceptual category goes to Kamran Kashef and Matt Hardy of the University of Michigan for their Economical Aphotic Sieving Machine.
At about 3,000 feet below sea level, the aphotic (complete darkness) zone begins.