You have to start with open water scuba before cave diving. Baby steps, you only get one shot while diving.
Then you have to learn the equipment and gas mixtures. But it is a blast, if you get the chance, do it.
Oooh! I went on a school trip to Kullu-Manali and did river rafting there with my friends!!! Didn't have time to do rock climbing and zip lining cause we were behind schedule!