The base was formally a geth testing hub to ensure obedient geth during the war between the quarians and their creations. With the quarians losing, they enacted a project that would create obedient geth that will fight for them. With the war reaching it's end, the remaining quarian government sent out a special order to shut down Site A and Site B. Liquidation teams were sent to both sites to destroy them with Site A being successful, however, Site B remained intact after the geth there started retaliating against the team that was sent to liquidate the area.