Dr. Olivette was the first overseer of Vault 81 and the only member of the "residential side" to know of the Vault's true purpose.
When Vault 81 was built, it was designed in two parts: a residential side, where the vault dwellers would live, and a secret wing, where scientists would conduct experiments on the residents. The goal of Vault 81 was to create a cure for all of humanity's illnesses. Doctor O. Olivette was picked by Vault-Tec from their candidate list after their prime choice, Duncan, fell ill.
Dr. Olivette was skeptical of Vault-Tec's goal and possible use of human experimentation, planning to blow the whistle if it was unethical. Upon received her full briefing, she discovered the complete unethical nature of the experiment as well as Vault-Tec relationship to major backers in the federal government, effectively eliminating the option of alerting any proper authorities. Dr. Olivette was still determined not to let the residents of Vault 81 be used as guinea pigs, so on the morning of October 23rd, upon receiving the "call" to start notifications of staff and residents, she sabotaged the call list. While residents still received notifications, the science staff weren't properly notified and didn't all report in. Her plan mostly worked, but three of the science staff still turned up anyway. Two were living nearby and arrived with the general population, while the third showed up to check when the next drill was.
Dr. Olivette was the only person on the residential side aware of the existence of the secret wing to Vault 81, which Olivette communicated with through a set of connected terminals. As the three scientists worked to create their cure, Olivette watched over all of their data and personally had to approve the scientists moving onto to Phase II, animal testing, and Phase III, human testing on unknowing participants.
Before Phase III of testing began, Olivette disabled all access to the residential side of the vault, effectively isolating the scientists from entering the other side, leaving the three scientists to die. She kept the vault's true purpose, and the existence of the secret wing, a closely guarded secret.
O. Olivette is only mentioned in Fallout 4.
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