The Big House is the eighteenth level of Marathon 2: Durandal and the first and only level of the chapter, Captured. After destroying Durandal's core circuits, you have been captured by the Pfhor (presumably under Tycho's orders). They've stripped you of all your weapons and placed you in a cell guarded by two Enforcers.
This map is very small. A number of Pfhor Fighters and Enforcers will battle it out against some BOBs outside your prison cell in a scripted sequence. There are no terminals, pattern buffers, or shield rechargers here.
This level is very easy. Just wait a few moments for some BOBs to teleport in and attack the Pfhor. The first wave of BOBs will be defeated, but just keep waiting—more BOBs will arrive shortly. When all the Pfhor Fighters and Enforcers are dead, you'll be teleported out of your cell to the next level, This Side Toward Enemy.
Since you're low on health, one stray bullet could kill you, so hide in the corner of your prison cell just behind the door. You don't have any weapons here, but if you really want to you can try to throw a few punches at nearby enemies with your fists.
- The phrase "Big House" is a nickname for prison... which is where you, the player, are.
- When this map is opened in a map editor, a written message can be found outside the bounds of the level. It reads, "JAIL BREAK, or PRISON RIOT?!".
Marathon 2: Durandal - Level 18: The Big House