They did try one myth involving a methane sewer gas explosion. http://dsc.discovery.com/tv-shows/mythbusters/videos/manhole-missiles.htm http://dsc.discovery.c

They did try one myth involving a methane sewer gas explosion. http://dsc.discovery.com/tv-shows/mythbusters/videos/manhole-missiles.htm http://dsc.discovery.com/tv-shows/mythbusters/videos/manhole...