On the upper level, two huge tanks sit in the courtyard; the player character will have to figure out a way to get past them. This map is a medium size. Once inside, the base leads into underground levels consisting of three large maps rigged with Brotherhood traps.
The base has been overrun by the Jackals and the player character must fight their way through until they reach Cyrus, a Brotherhood survivor and Maxus' father. Cyrus will fight alongside the player character until he is killed by Banshee, leader of the Jackals.
The ensuing battle will lead to Banshee's defeat, at which point the player character threatens him into handing over the key to Vault 39, but before he reveals who is really behind it all, he explodes.