Fort Vorta Bella
Fort Vorta Bella is located on the Vorticon VI Military Installation Island. It is possibly the strangest fort on Vorticon VI. Instead of existing in a building, the fort seems to have been built into the side of a mountain. This suggests that the fort may have been used for secret meetings at some point in the past. It might also have been a base of operations for the Grand Intellect shortly before he took over Vorticon VI.
Regardless, the fort clearly is not used for such purposes now. With only standard Vorticon Grunts and Youths, the fort appears to be used now as a hidden watchtower, or a training facility. Near the end of the level, a flag with the letters "GI" in SGA can be seen. They probably stand for "Grand Intellect" (though the G.I. term for a soldier comes to mind).
See also List of Keen 3 levels.