Located at the center of the underground floor is a spacious arena mirroring a coliseum. It is dome shaped, with various entrances in the sandy pit where Experiments are dragged and left to fight to the death with artificially created monsters, wild animals such as panthers, bears, or boars, or against other Experiments. It is here that Researchers observe the serums effects in combat, and to see how well the Experiments perform with the newly obtained abilities.
