Synonyms of deep-sea

deep-sea

adjective

ˈdēp-ˈsē 

as in oceanic

of, relating to, or occurring in the open sea

chartered a boat to do some deep-sea fishing

Synonyms & Similar Words

• oceanic
• marine
• pelagic
• blue-water
• deepwater
• maritime
• nautical

Antonyms & Near Antonyms

• littoral

Example Sentences

Recent Examples of deep-sea

After a Soviet ballistic missile submarine sank in the Pacific Ocean in 1968, the CIA secretly built the Hughes Glomar Explorer, disguised as a deep-sea mining vessel, to recover the wreck from nearly 5,000 meters (16,500 feet) below the surface. — Kaif Shaikh, Interesting Engineering, 6 Aug. 2026

The tests demonstrate the underlying sensing and healing mechanisms, not a finished skin ready to spend years clinging to a deep-sea robot. — New Atlas, 4 Aug. 2026

Guest adventures can be tailored to nighttime fishing, wintertime Wahoo trolling, or full-moon deep-sea excursions. — Kelsey Glennon, Southern Living, 3 Aug. 2026

Scientists have found an active coral community that may belong to a deep-sea coral reef system presumed to be dead decades ago, according to new research. — Julia Jacobo, ABC News, 23 July 2026