"The Vault is a structure created by the Combine before the completion of the Citadel and is located in the Quarantine Zone within City 17. The purpose of the Vault is one of the major plot points of Half-Life: Alyx."
"The Vault was built around a building specifically to contain the G-Man, who was found inside said building. From the outside, the Vault looks like an enormous floating metal ship." Read more: https://half-life.fandom.com/wiki/The_Vault
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