When the player meets Pierce Rogers in Doom 3, he asks if all the demons the player just fought are dead. Upon seeing that the player has the Soul Cube, Pierce states that his research of the tablets led to the conclusion that the Soul Cube could end the demon invasion. He tells the player to reach the Caverns quickly, and to take his PDA which has security codes. He further tells the player that he won't be accompanying him, as he has to complete his research, wishes the player good luck, and says that he will lock the door after the player leaves. If the player persists in speaking to him, he will reaffirm that he has to continue his research.