The vault

The Vault is one of the four original supervillain prisons operated by S.H.I.E.L.D.. It was built by Tony Stark and designed for technology based villains and as a storage facility for the villains' gear and weapons. HYDRA and A.I.M. have the most people locked up in the vault, along with their leaders.
Prisoners come in via the landing pad near the top, where they then go through a scanner and their gear is examined to see what kind of cell they belong in or if they are sneaking anything inside.
Normal tech villains are placed in standard holding cells with laser bars keeping them from escaping, while a few are specially designed for villains that are required to wear their gear to survive (example is the Blizzard & Living Laser). The more high profile villains are staged in solitary cells further down the tower, each designed to that specific villain being held inside.
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