On Tuesday night the Science Channel is premiering its new show "Secrets of the Underground" about all the mysteries hiding underneath the feet of all of us.
For example, did you know there is a a minefield of fault lines intersecting deep under the ground here in the Bay Area that scientists say could set off a mega quake?
Or what about the rumors of escape tunnels underneath Alcatraz?
We were joined by Rob Nelson, host of "Secrets of the Underground." Watch the interview in the video box above.