gas, act fast. call 911. >> really? >> absolutely. if you smell gas, don't play around with it. get it done. >> we wa to help you out here and bring is this home for you s what happened. the san bruno blast happened when a 30-inch pipeline exploded. match natural gas pouring out of that. then if it explodes -- there are 2.5 million miles of pipeline in the country. that's enough to circle the earth 100 times. you can get a i sense of how mu it is on this map. look at all of that. you can see the blue and yellow. the blue states, that'sun pipelines that run through multiple states. and then there's the red ones as well. this website, the one right here, take a look at that one. that website is a national pipeline mapping system that litlets you see the pipelines in your area. and also here, this one talks