If we can get a nuke down the well then we can get cement down the well and theres no need for the nuke.
The nuke does not need to go down the hole, it can be beside the hole. When it goes off, it will - hopefully - seal it.
Like I said in a previous post, it is not a guaranteed fix, but if the only other option is to hopelessly watch all of the oil leak out over the next ten years, then it's worth a shot.
what if the casing itself has deteriorated, as has been suggested by this Shell guy.