Longman Dictionary of Contemporary English
sub-aqua
adjective
EXAMPLES FROM CORPUS
▪ Cheap swimming goggles fit Whopperbears but don't let it be tempted to go sub-aqua!
▪ Cousteau's An original seafood restaurant with sub-aqua atmosphere.
▪ Of course we don't carry sub-aqua gear to check out these features before fishing: we can only discover them through practice.