Extreme travel? Why not! We have done something extreme again at Jomblang Cave which is located at Gunung Kidul, Yogyakarta. Maybe this place isn’t too famous for us, but many foreigners had visited it. Even when we visited the cave, only three of us were local among the sixty guests. Jomblang Cave was formed from the geological process of soil subsidence to the earth’s base. So, this cave is a bit different from the others, it’s a vertical cave! And, we would do caving to a depth of 60 meters by using a single rope. Yippee! However, you don’t have to worry because the operator will check the safety in…