The Department of Defense is experimenting blowing up tunnels using a 700 ton bomb. They're doing it at the Nevada Test Site (you know, where they blew up the nuclear bombs). But we're not to worry because it will be safe.
However in their report:
"Since suspended natural radionuclides and resuspended fallout radionuclides from the detonation have potential to be transported off of the NTS by wind, they may contribute radiological dose to the public."
But really, it'll be o.k.
The state of Utah isn't buying it.