I think the Myans have it pegged. They even went out on a limb, saw in hand, and predicted the exact time this event may occur.
Noah built an ark, I may have to build an "Iron Diamond"... An idea I came up with to survive Anything. Imagine a spaceship looking thing, long on the bottom for ballast, with triple layered 3/8" steel, staggering the seams and coating everything in two part epoxy.
That should hold back mother earth, but a nuke would probably melt the fuckin' thing.