Fallout: Ranking Every Vault From Least To Most Horrifying

What happens when you don't put enough living space into a Vault, rely on recreational things such as swimming pools and pack an armory to the gills with absolutely loads of weapons? In New Vegas's Vault 34, it meant riots, damage and ghouls.

The overabundance of guns in the Vault's armory naturally led to a great emphasis on gun culture within the Vault, but foreseeing problems between the dwellers and their access to weaponry, the Overseer quickly took steps to remotely lock down the armory from their terminal.

This didn't sit very well with the inhabitants. Demanding access to the armory, they were refused by the overseer, so they start rioting and left the Vault at some time around 2231.

Due to the Vault's lack of living space it also began to become overpopulated; when the rioters left, this made more space for the people, but overpopulation still took over again. The overseer then tried to force population control measures on the residents and - again - they didn't like this. In the ensuing turmoil the Vault was damaged extremely, with the annoyed dwellers damaging the reactor cooling vents, main computer systems and the Vault's structure in general.

The reactor couldn't be repaired; it started leaking heavy radiation into the Vault, and the exit to the Vault could no longer be unsealed. This led to the residents slowly being turned into Feral Ghouls and Glowing Ones.