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
Atharva Gosavi, Interesting Engineering, 2 June 2026
Across undersea cables, satellite arrays, and AI data hubs, global precautions are still in their infancy.
—Ken Silverstein, Forbes.com, 1 June 2026
The advent of huge AI data centers around the world has heightened the importance of the networks of undersea cables.
—Tim Lister, CNN Money, 31 May 2026
For less than the price of one such vessel, the Navy could add a fleet of unmanned surface and undersea vehicles that could address a broad range of risks.
—Editorial, Boston Herald, 30 May 2026
See All Example Sentences for undersea
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Adjective
With the Hai Kun nearing delivery, the modernization of the Chien Lung-class submarines nearing completion, and advanced torpedoes scheduled to arrive next year, Taiwan’s navy is steadily expanding its undersea warfare capabilities and strengthening its maritime deterrence posture.
—Atharva Gosavi, Interesting Engineering, 2 June 2026
Across undersea cables, satellite arrays, and AI data hubs, global precautions are still in their infancy.
—Ken Silverstein, Forbes.com, 1 June 2026
The advent of huge AI data centers around the world has heightened the importance of the networks of undersea cables.
—Tim Lister, CNN Money, 31 May 2026
For less than the price of one such vessel, the Navy could add a fleet of unmanned surface and undersea vehicles that could address a broad range of risks.
—Editorial, Boston Herald, 30 May 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 8 Jun. 2026.
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