oil spill in the gulf, i asked aubrey mcclendon about the safety of fracking. what would happen if you go down to dig for shale, and you have an explosion and you destroy a whole part of the country? >> mcclendon: it cannot happen, okay? >> stahl: it cannot happen. why do you say that? >> mcclendon: well, because we're not a mile underneath the surface of the ocean. and if something were to get away-- and there are incidents where wells have loss of control-- you can go... you can go fix it. >> stahl: an underground explosion is impossible because there's no oxygen or anything to ignite a blast. but as you can see from these pictures chesapeake took of their operations, drilling is now a fact of life near homes and farms. and the industry has racked up thousands of accidents and safety violations above ground. this really is your backyard on... oh, look at this. what happened in tim and christine ruggiero's backyard is happening more and more. they moved to this pastoral ten- acre ranch in decatur, texas, in 2004 to raise their horses and their daughter, reilly.