All of which depends on getting to the caves before the disaster begins. If you know when TEOTWAWKI will happen, keep your big mouth shut and start manipulating the stock and bond markets. Who cares about laws against "insider trading" - because there will be nothing left to prosecute you.
And about the caves. I'm going to ask the same question I ask about any survival heaven - what are you going to do about the garbage and other waste products that are going to be created? The only place I know of where you probably will not have to worry about putting some infrastructure in place ahead of time is Antarctica - if you dig a small pit and start dumping your waste in, it will start composting and not melt its way to bedrock for about 300 years (at leasdt based on the waste pit at Ross Station).