Here's a pretty good video showing that: http://www.youtube.com/watch?v=QIdufnmoeeY http://www.youtube.com/watch?v=QIdufnmoeeY The dome was pretty small and ma

Here's a pretty good video showing that: http://www.youtube.com/watch?v=QIdufnmoeeY http://www.youtube.com/watch?v=QIdufnmoeeY The dome was pretty small and made of metal. It seems like if the dome was very large and heavy it would work. My point in all of this is to argue that it's possible to contain the spill using a brute force combination of the cap's size, weight and shape. And that the reason that the spill has not yet been fixed in not due to it being un-fixable, but likely other factors.