Fallout: Ranking Every Vault From Least To Most Horrifying
13. Vault 12 - Studying Radiation By Not Closing The Door Properly
Ideally, when you're in a nuclear fallout shelter, you want it to keep the nuclear fallout, well...out.
Vault 12's inhabitants in the original Fallout weren't so lucky. Although the Vault was filled with resources with 'every amenity in mind for the prospective Vault Dweller' and fitted with advanced water purification systems, Vault-Tech purposefully designed the Vault's door so that it wouldn't close properly, meaning the population were steadily exposed to extremely harmful levels of radiation.
This massive dose of harmful rays killed a significant portion of the Vault's inhabitants and for those who survived, they turned into Ghouls (Fallout's zombie-like folk. Sunken eyes. Burnt skin. General sense of decay. Those guys.).
On the plus side, after being Ghoulified, the dwellers left the Vault and founded the Necropolis ghoul settlement.