We are constantly amazed by cool people doing awesome activities in spectacular places. i.e. below video: https://vimeo.com/84760592
Caves are so fascinating for so many reasons: they are mysterious, immortal, majestic, and, most of all, limitlessly explorable. Winching around the flat waters of this 'grotto' is just another means of exploring a tremendous natural wonder.
I was lucky enough to do some underground 'blackwater' rafting in New Zealand a few years ago and it was an experience of a lifetime. Turn your headlamp off for a bit and all you can see are millions of glow worms like stars in a perfect night sky.
Of course, you have to get into the caves somehow. In New Zealand the journey started with a 300 foot rappel into pitch black darkness.
Lebanon wakeboarding video spotted in this BBC Article.