[Ronaldus Magnus]

If you could vent the pressure with drilling and/or conventional explosives, it would already be too late to avert the disaster. Again, if there is even the faintest chance of the article's apocalyptic forecast actually happening, a little above ground nuclear fallout will be the least of anyone's worries.

[HiTech RedNeck]

Mountains more than a mile wide are blasted through in a year or so, without nukes. Taking a decade to get down there (magma is less than 10 miles below) doesn't sound like a bad plan. That's less than a moment on a geological scale.