Something really big is happening down there in the Earth's core. Something amazing.
Remember the days when this stuff was fringe nut fantasy? What happened? Vault-Co was just sitting in place and somehow we drifted right into the mainstream without budging at all. Ten years ago, magnetic reversals were the stuff of alien UFO blogs and new age prophecies. Vault-Co was one of the first sites to predict that 2012 would coincide with incredible changes to the Earth's magnetic field and a reversal that would herald a new ice age. Of course, in all fairness, we got these notions articulated with the help of Robert Felix at http://www.iceagenow.com/ and his marvelous book.
When the magnetosphere inverts, the surface of this planet will cook with radiation. Anything topside will be grilled like they were basting on George Foreman's greaseless slow cooker. Gamma ray counts in the thousands in a single day for anybody topside. That's why you need a Vault and it needs to be in deep bedrock.