Fallout shelters can cost millions of dollars. But this DIY underground bunker costs about $1,000. You wouldn't want to live in this makeshift underground bunker forever. In a pinch, this DIY fallout shelter would be better than an above-ground building, an expert said.In the event of nuclear war, the ultra-rich can hide away in their luxury bunkers that cost anywhere from $35,000 to $14 million. But what about the rest of us?Turns out, if a nuclear attack is imminent, you can build your own DIY fallout shelter for relatively cheap.You would just need a couple of days' time, some equipment,...