BP has failed for a month to stop the oil coming from their failed well. Any definitive solution is said to be at least two months away. In the 1960s, Russia found they could close oil or gas wells by drilling parallel to the original drill hole however many thousands of feet it took to make them feel safe, dropping a small nuke down, and detonating it. End of drill hole.
The idea was broached a few weeks ago, but I don't think anyone took it seriously until multiple BP efforts failed. Now it's beginning to show up on Bloomberg and business TV channels.
I don't think it's going to happen, but for cultural rather than scientific reasons.