Vault Raider

People decided to build and live in vaults when the end was coming. However it never happened quite like they expected so the vaults are filled with traps and are not inhabited by anyone. One day a stranger came and offered a trade for some supplies if a raider would go into the vaults and get a vial of green liquid hidden somewhere deep inside the vaults. You must collect key cards to access computers in order to open doors within the catacombs.