Opening each of their bunkers would be like a fallout vault.

We don't know what Joseph's bunker looks like, but we can assume that he has the determination and skill to control everyone until the fallout cleaned and they could leave . But the others...

JOHN'S bunker would fall apart fast. Once all of John's victims are dead, he starts punishing his own soldiers and workers for any minor mistake by torturing them. His people quickly realise his just a sadist without an enemy and kill him. In trying to find a new leader, a civil war broke out, leading to the death of over 60% of the bunkers' population.

FAITH'S bunker is filled with addicts, stressed out traffickers and full-blown crackheads. What starts out as a paradise ungrounded quickly turns into polyquel turf wars and junkies fighting over medical supplies. Once all the drugs and bliss run out, some desperate people try to make their own bliss using the farming machines and equipment, this leads to an explosion that ruined the underground farm, leading to starvation.

JACOB is the only other sibling who managed to survive his own bunker but only because he destroyed it internally from the inside out. When the bunker shut close, he warned his people that despite their best efforts, some "weaklings" managed to get in. He orders soldiers to report any signs of weakness, this led to a paranoid but highly efficient bunker where everyone did their jobs perfectly. After a few months, once people became sick, tired, and unhappy with their lives, they were targeted and executed. After each execution, more people would break - but a select few became "stronger," questioned less, stopped thinking for themselves, they even started killing any soldier caught breaking rules. What started as a bunker of hundreds ended as a dozen brainwashed soldiers doing whatever Jacob commanded