I had the chance to trek the mountains surrounding Mt. Pinatubo in 2017 with my friends/colleagues from Bangkok and Manila. I went to the Philippines in May to conduct a training to a new team in the office and during the weekend, we decided to explore the mountainous area wherein the last recorded eruption was in 1991. I was still young that time, but I could still remember the seemingly endless ash fall raining down upon us and the dark skies that covered the major part of the main island of Luzon.