race to prevent a worse case scenario. >> hey, the mobile press register has published a leaked memo from officials that is quite alarming. it says in a worse case scenario, the leaking pipe could rupture and fail entirely causing an underwater gusher of oil releasing millions of gallons a day. worst case scenario but they are writing about it and talking about it. that's why the race to seal the leak in here is so critical right now. so urgent. let's look at the enormous challenges being faced in this as we put it out of the way. first, location. let's travel south from up here on the relatively shallow waters of the continental shelf until the seabed plunges down to where this leak is. it is pitch black even at high noon here. there is no way you'll see anything. and i can bring out some video here taken some years ago. not terribly long ago. a little further on the texas coast. you get an idea even down to