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

The first deep-sea scientist from the Seychelles dives below the surface of the Indian Ocean. — Tanya Fedak, Variety, 22 Oct. 2026

When a whale dies and sinks to the ocean floor, its carcass provides sustenance for deep-sea organisms for centuries, triggering a shockwave of life. — Brian Davids, HollywoodReporter, 20 Oct. 2026

Voyages from Antarctica to deep-sea archaeological sites helped redefine the role of the modern superyacht. — Robb Report, 9 Oct. 2026

The equipment was part of a network of 900 deep-sea instruments that had been anchored off Oregon, Washington State, Alaska, North Carolina, and an area between Greenland and Iceland known as the Irminger Sea. — Eric Niiler, New York Times, 3 Oct. 2026