un·der·sea
adjective/ˈʌndəsiː/
/ˈʌndərsiː/
[only before noun]- found, used or happening below the surface of the sea
海面下的；海底的 - undersea cables/earthquakes
海底电缆／地震
Oxford Collocations DictionaryUndersea is used with these nouns:- earthquake
- volcano
- undersea cables/earthquakes