10 Terrifying Fallout Vaults You Wish You'd Never Opened

Honestly I don't think there's a greater example of cruelty than Vault 12 in the entire Fallout franchise. And it's not some devious plan that required multiple minds working together or strange noise experiments or hallucinations; all this required was for the Vault Door not to close.

The residents of Bakersfield flooded Vault 12 when the alarms sounded and it was at max capacity within minutes, families all scrabbling over one another for safety, and as the bombs tore deep wounds into the Earth and spread its deadly destruction the Vault door began to close...then stopped.

Those that survived were trapped within the Vault but were unable to stop the steady and deadly leak of radiation from seeping inside. It turned out that Vault-Tec simply wanted to study the effects of radiation on the inhabitants and they got their sick wish.

Over the years the residents became irradiated ghouls and while many lived on in this new form, it was not a good life. The Vault was finally opened years later but the damage had been done, and those that chose to stay formed Necropolis, aka the city of the living dead.