Usage Note
Sottomarino functions as both a noun (il sottomarino — the submarine) and an adjective (cavo sottomarino — undersea cable). As a noun the plural sottomarini is regular. The literal composition is sotto (under) + marino (marine/sea).
Examples
"Il sottomarino è rimasto sott'acqua per settimane."
Natural Translation
The submarine stayed underwater for weeks.

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