This was an adventure I always wanted to do, from the moment I saw the documentary in youtube back in 2012. However, due to the lack of experience in outdoor activities, I had to drop the idea. Then in February, I got to know that Thinuwan had been there. I suddenly got an adrenaline rush and determined to explore the underground lake. By this time, I’ve already done several hikes, and was confident about my fitness level.