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Fallout 4 Open Vault Door Get Out of Vault 111. Also shows how to do sneak attack.
This occurs in the latter part after the heroine wakes up from her cryogenic sleep. Pick up the watch device from the floor near the controls to the vault door and open it. That device is the Pip Boy.
There is a sliding door that cannot be opened initially from the cryogenic chamber. Once you enter the vault door chamber it is opened.