un·der·sea
ˌən-dər-ˈsē 
1
: being or carried on under the sea or under the surface of the sea
undersea oil deposits
undersea fighting
2
: designed for use under the surface of the sea
an undersea fleet
Examples of undersea in a Sentence
Adjective
They are conducting undersea research.
Recent Examples on the Web
New Atlas,
5 July 2026
German federal prosecutors on Thursday filed charges against a former Ukrainian army officer over undersea explosions that damaged the Nord Stream gas pipelines between Russia and Germany four years ago.
—
ABC News,
2 July 2026
Its design placed relatively few compromises on undersea combat performance.
—
Kaif Shaikh,
Interesting Engineering,
29 June 2026
Moscow also backs cyber-warfare campaigns and sabotage of undersea cables.
—
Tom Chivers,
semafor.com,
15 June 2026
See All Example Sentences for undersea
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Adjective
Some of these placements are simply down to necessity; undersea cables are the only practical way to link continents with high-bandwidth data, and pipelines often have no viable overland route.
—
New Atlas,
5 July 2026
German federal prosecutors on Thursday filed charges against a former Ukrainian army officer over undersea explosions that damaged the Nord Stream gas pipelines between Russia and Germany four years ago.
—
ABC News,
2 July 2026
Its design placed relatively few compromises on undersea combat performance.
—
Kaif Shaikh,
Interesting Engineering,
29 June 2026
Moscow also backs cyber-warfare campaigns and sabotage of undersea cables.
—
Tom Chivers,
semafor.com,
15 June 2026
See All Example Sentences for undersea
Cite this Entry
“Undersea.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/undersea. Accessed 6 Jul. 2026.
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