For those who are interested, here is the main waterfall.
No one is allowed to swim directly under the waterfall - thereβs a viewing platform patrolled by rangers and more rangers on the ground, to stop such a beautiful place being ruined by footfall (or swimfall), but itβs not far to walk to swim further along.
There is a slightly smaller, but still very impressive waterfall you can swim under (and leap off, if youβre brave enough).