" Eventually, Chell reaches a large chamber where GLaDOS' hardware hangs overhead. GLaDOS berates Chell and prepares a "surprise", only for a personality core to fall off; Chell drops it in an incinerator. GLaDOS reveals that Chell has just destroyed the morality core, which the Aperture Science employees allegedly installed after GLaDOS flooded the enrichment center with a deadly neurotoxin, and goes on to state that now there is nothing to prevent her from doing so once again."