deep-sea

[ deep-see ]

/ ˈdipˈsi /

of, pertaining to, in, or associated with the deeper parts of the sea: deep-sea fishing; deep-sea diver.

Origin of deep-sea

First recorded in 1620–30

And only in the high seas do we find living organisms that are more than 8,000 years old, such as deep-sea corals.

‘Mission Blue’ Warning: The Ocean Is Not Too Big to Fail |Sylvia A. Earle |August 15, 2014 |DAILY BEAST
It turns out that Cameron has a hobby: deep-sea exploration.

James Cameron Dives into the Ocean's Abyss |Andrew Romano |July 21, 2014 |DAILY BEAST
It joins a list of five deep-sea exploration vehicles that have been lost or near-fatally damaged on the job since 2003.

Lost Ocean Rover Leaves Gap in Biology and Alzheimer's Research |Beenish Ahmed |June 9, 2014 |DAILY BEAST
Researchers are also exploring how deep-sea trenches bury carbon and other chemicals in the seafloor.

Lost Ocean Rover Leaves Gap in Biology and Alzheimer's Research |Beenish Ahmed |June 9, 2014 |DAILY BEAST

Built in 2008, Nereus featured completely new technology to meet the unique challenges of deep-sea exploration.

Lost Ocean Rover Leaves Gap in Biology and Alzheimer's Research |Beenish Ahmed |June 9, 2014 |DAILY BEAST
Here he suddenly felt the toneless; he had the feeling one might have on looking at a deep-sea fish: it is lifeless, toneless.

The Goose Man |Jacob Wassermann
Deep-sea weeds as a rule contain more iodine than those which are found in the shallow waters.

Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 6 |Various
Our escort is now joined by British sloops returning from their deep-sea patrols.

Merchantmen-at-Arms |David W. Bone
I was greatly struck by some of Mr. Bremner's views on deep-sea founding.

The Cruise of the Betsey |Hugh Miller
My cousin reflected a moment on the possibilities of the deep-sea life.

The Sea Lady |Herbert George Wells

deep-sea

(modifier) of, found in, or characteristic of the deep parts of the sea deep-sea fishing