CNN CNN Newsroom March 4, 2013 16:05:00
How precarious is the earth? i'm thinking about the homes on either side of this home or entire neighborhood. how bad is this? >> well, put it this way, there have been helicopters overhead and we learned just today there was a restriction for helicopters because they didn't want the helicopters to vibrate the ground. they were concerned that could make the hole open even more. the land we're looking at over here, they are even concerned about that track hoe where it is, it's a delicate operation. and in some cases they have crews tethered to make sure nothing happens if the ground gives. >> u...