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After that is completed, the player character will be told to Explore Vault 88, triggering the related side quest. Its switch is on the large control board in the middle of the room. Once she has consulted the terminal, she will ask the Sole Survivor to turn on the radio beacon in the entranceway where Security Chief Andersen was encountered. If one grants her wishes, the Vault 88 overseer's desk must then be built with the workshop for her. The achievement Oversight may also be gained here. There is also the option to expel Barstow from the vault, permanently failing and ending the questline, but giving the Sole Survivor control of the entire vault and granting access to all of the prototypes. If one chooses the 'Vault-Tec are bastards' option in dialogue, she will understand, and state that the program can be altered to be more ethical to the test subjects (though the player character can alter the parameters of each experiment to be ethical even if this dialogue option is not chosen). Once all the ghouls are dead, Barstow will explain that Stanislaus Braun tasked her with a vital experiment for Vault 88. Barstow will ask him to stop, before realizing he no longer responds, and will request the Sole Survivor to put the rest of the construction team out of their misery. The nearest one, Julian, will become hostile if one gets too close to him. There are several feral ghouls and even a glowing one nearby who used to be part of the construction team working inside the vault.
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After reaching Valery Barstow, she will ask the Sole Survivor to follow her as she explains her situation.