I am interested in the following tour and i found it on the website: http://www.thaiaccesstours.com/chiangmai_rock_climbing.html But they told me to email peak adventure tours Chiangmai Adventure rock climbing program 4 : Extreme Caving 3 day trip 530 feet high. Pai, Mae Hong Son Thailand. The entrance of the cave is the size of 2 football fields, deep in the vertical for 200 meters. Down Under is still unexplored, collapsed cave with an untouched, primeval forest at the base. The area has lots of potential for undiscovered systems.The only away to go in and out is just by the Rope.