and so bear in mind that in the earth's crust there in the seafloor, you have a big pipe casing. then you put in a smaller one. it gets down all the way to seven inches. down very deep, almost two miles down, in the earth's crust. so that whole drill string below the earth's surface may have been rattled. and i had this model rigged up. here's the new cap which has a relief valve on it. this would go to the surface. but you've got to think of things below the seafloor. if this were the seafloor, this drill string goes down, down, almost two miles. so anywhere along this string, in the earth's crust, what you might think of as solid rock, after you give it a jolt big enough to explode a drilling platform, there could be cracks down there. what you end up with is oil coming out all over the place in the seafloor. now, everybody's hope is when this valve is closed, this valve up here or this series of valves