Vault 81 (quest)

Vault 81 is a quest in Fallout 4.

Detailed walkthrough
When the Sole Survivor arrives at Vault 81, they proceed to connect his Pip-Boy to the entrance button in an attempt to open the vault doors, however they is greeted by the present occupants of the vault, who are descendants from the original members of Vault 81.

The vault is one of the few that hasn't been captured or overthrown, and remains orderly and secure for the residents.

The Sole Survivor from Vault 111 is told by the overseer of Vault 81 that if he/she wants to enter their vault, they need to bring 3 fusion cores.

When having returned with the cores, the player character will be allowed to enter the vault, and the Overseer Gwen will welcome them to the vault, and the Sole Survivor will be allowed to trade and interact with the residents of Vault 81.