This guy calls himself the earths watchmen, produces an entertaining YouTube channel featuring natural and less than natural phenomenon; https://youtu.be/7x7IzfJ53jE
When I heard him say 7km depth 6.5m earthquake Q suddenly seemed a lot realer to me. They are far more likely to be an explosion than a 'shallow earthquake'
Combined with;
articles about the military training in tunnel warfare, https://www.military.com/daily-news/2018/06/24/army-spending-half-billion-train-troops-fight-underground.html
as well as multiple other points of consideration that will remain unsaid by many because they are terrible beyond belief.
