WATCH: Explosion in NY sewer sends manhole cover flying
Even for sewer professionals who spend their careers underground, there are countless unknowns lurking in the sewer system. Dangers are just as common.
As a Buffalo, NY news crew covers an underground fire, an explosion underground sends a manhole cover flying. Weighing in at least 100 pounds, it gives you an idea of the strength of the blast and the risks maintenance personnel take when they work underground.
Thanks to Scott Broski for the link.