The eruption of Japan's Mount Ontake volcano is the latest example of how merciless nature's might can be and how, despite 21st century technology, we're still not able to always predict these things.
Tragically, as of today, this eruption has claimed the lives of at least 47 people. Mount Ontake is a popular hiking destination and the eruption occurred at a time when there were lots of walkers on the mountain and in an area that included a busy mountain lodge. Unfortunately, with little or no warning than an eruption was about to take place, nobody was prepared for such a catastrophic event.
This video was shot by some lucky survivors who were further away from the eruption site, but shows how frightening it must be to get caught up in the subsequent ash-cloud: