Meaning of the word undersea in English

What does undersea mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

undersea

US /ˌʌn.dɚˈsiː/
UK /ˌʌn.dəˈsiː/

Adjective

situated, occurring, or done beneath the surface of the sea

Example:
Divers explored the vibrant undersea world.
They discovered an ancient city on the undersea floor.