Many inhabitants of Florida in the 60's tried to combine their shelters with their living space.
The initial expense is always going to be greater than a conventional home. Switzerland solved this problem with economies of scale. There was an American who intended to do the same but they sabotaged his plane and blamed Russia. His name was Lawrence McDonald and he was the last real conservative standing between America and the march to world government. When he died, America's last chance at a real civil defense program died with the legislation that McDonald had waiting in Congress when they blew up his plane. McDonald thought his cousin General Patton had been killed the day before he was due to return home from World War II because Patton would have almost certainly been President. McDonald was rumored to be an easy election to the White House himself. How convenient all these mysterious deaths of possible opponents, starting with John F. Kennedy and all his relatives one at a time. Nobody was safe with the wrong political ideas no matter how harmless - even Sonny Bono got beaten to death in the woods in what was claimed to be a "ski accident" in a secluded grove. A "ski accident" that left his face missing. Ted Gunderson is a lucky fellow who appeared to be one of the rare exceptions to die of cancer first. Ted was a reliable insider who said the things going on in the United States were a million times worse than what anyone would believe.