The inside of the EGG Installation first appears in a post-credits cutscene in Digital Devil Saga: Avatar Tuner, showing Sera attached to several wires hooked into a machine. The facility itself does not fully appear until Digital Devil Saga: Avatar Tuner 2, where it becomes a dungeon that must be explored on two separate occasions. The first time that the Embryon infiltrate the facility, they have to track down key cards in order to get to where Sera is being held. On the second visit, the power is turned off and many vortexes have appeared throughout the damaged facility. In the Japanese version of the game, it was give the English title "Egg of the Universe."
After the second visit, the vortexes will have disappeared and Gale can interrogate a researcher in order to start hunting the Seraphs. After successfully interrogating the researcher and then talking to him, Uriel can be found in the room where the Embryon faced the Tribhvana for the last time.