It's an absolutely pointless waste of time.
It takes 4 hours to get to the cave in one direction in the format of an excursion. In total, you spend the whole day in the car.
And the time in the cave is really about 5 minutes, you sail away from the entrance by about 30 meters, turn around and swim back. No waterfalls, stalagmites and different levels are included in the review.
The cave itself, accessible to inspection, is uninteresting and ugly. It is better to look at professional photos on the Internet than to waste time on this pointless and tedious trip.
A gorgeous road along the serpentine from Side, a 100L + 150L departure for a boat ride (10-15 min). The place is interesting, it was opened only 50 years ago.