A large vault in Warden Meece’s office where he kept the diamonds mined by his prisoners. During Shard’s attack on the prison while he was still the size of a normal kat, he was knocked inside the vault by the SWAT Kats. All of the diamonds fused to Shard’s body, causing him to grow to enormous size, breaking out of the vault, destroying it, Meece’s office and the entire prison administration building.