Chell breaks a Morality Core that fell out of GLaDOS . GLaDOS continues to plead with Chell , but during the exchange one of GLaDOS ' personality core spheres falls 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 .