Vault-Tech's experiments in post-apocalyptic vaults ... the inhabitants refused to participate, the vault doors would be opened and the dwellers, be congratulated for their perseverance.

There are five major vault locations in total. They are located in Crime City, Masked Meadows, Seaport City, Lonewolf Lair, ...

Each of them will spawn in every round, so there's no element of randomization to worry about. But since the loot inside is ...