Terraprint Secret Cave behind a waterfall - Geheime Höhle hinter einem Wasserfall

Here is my attempt to make a waterfall with a hidden cave behind it (you have to swimm through).

Hier ist mein Versuch, einen Wasserfall mit einem versteckten Höhle dahinter zu machen (Sie müssen durchschwimmen).

@Avanar : i tested the technical smoke to simulate some foam or mist - as you suggested - but particles glow too much and effect is not that nice