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Fort Vox is the twelveth level (in the official numbering) of Keen 3. It is located in the Military Installation Island, in the same area as the other forts (Fort Vorticon, Fort Vorta Bella and Fort Cavort). It is optional, as all the military levels, and it is quite hard to complete (unless Keen finished it through the upper exit).
This level is completely indoors, unlike most levels in Keen 3. It has two areas: an upper, military-like area, with its exit; and a lower, cave-like area with its own exit. It is worth noting that in the middle of the level, there is an "Exit" sign in SGA poiting to the right; however, even though there are two exits in the level, there is none in that direction (and the only thing in that direction is a cake and the possibility of dying).
This level has an unusual amount of chemical barrels, suggesting that this fort is either used for experiments, for waste disposal, or for storing of dangerous materials. In this level, lasers shoot out of almost everything: regular laser cannons, Pistols, moving spikes and even from lamps. It is the only level where lamps and moving spikes shoot laser beams.
The upper area is protected by Vorticon Grunts, and the lower area by a couple VortiNinjas. The cave area also contains a large number of Meeps. It is possible that they are used for military purposes, as the nature of their deadly sound waves could have tactical advantages.
There are two keycards to get in this level: a yellow one (which leads to the dead end indicated by the "Exit" sign); and a red one, which leads to the main part of the cave area.
See also List of Keen 3 levels.