The Fallout TV series introduces a trio of new, interconnected vaults - 31, 32, and 33. We find out by the end of the show that 31 holds a bunch of pre-war Vault-Tec employees in cryostasis and that the other two shelters are breeding pools for when they awaken.
Vault 32 found this out, with one of its inhabitants scrawling "we know the truth" onto the walls in their own blood after a mass suicide, but fans aren't convinced that merely uncovering the purpose of the vaults is what led to their death.
"It's heavily implied that the experiment is a lot worse than they ever say in the show," one Reddit user posted. "I suspect 33 was the prime breeding pool, the vault where the people with the most desirable managerial traits were kept and partnered up.
"I suspect 32 is where the undesirables were kept and sent from 33. Possibly even sterilising the 'worst' of the bunch. The marriage would make sense if Moldaver (posing as Vault 32's overseer) convinced Betty that someone of good breeding stock had been born and needed to be transferred."
One of the TVs in Vault 32 is playing the controversial Rat Utopia experiments from the '50s to '70s conducted by John B. Calhoun. In these experiments, Calhoun and his researchers created enclosed spaces where rats were given unlimited food and water, resulting in massive overpopulation.
The mice grew more destructive and anti-social in their complacency until eventually, they couldn't physically reproduce anymore, dooming them to extinction. It's possible that, unbeknownst even to the employees held in cryostasis, that Vaults 31, 32, and 33 were headed to a similar fate, and that the TV was teasing as much.
Another theory is that the breeding pools were being used to create the 'perfect super manager', using Vault-Tec employees as stock. This is why the original poster believes Vault 32 is where people with 'worse' genetics are sent, gutting traits counteractive to the experiment's end goal over time by removing people
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