un·der·wa·ter 
/ˌʌndɚˈwɑ:tɚ/ adjective
/ˌʌndɚˈwɑ:tɚ/ adjective : located, used, done, or happening below the surface of water
▪ underwater caves/volcanoes ▪ underwater photography ▪ an underwater camera
▪ underwater caves/volcanoes ▪ underwater photography ▪ an underwater camera
— underwater adverb
▪ swimming underwater
▪ swimming underwater
