The Port Vincent military has chosen a special place to make a military research base, sector 12. The location is off limits to the public, but there is an encrypted file that is located somewhere in the planned underground tunnels of Port Vincent City. The encrypted file contains the coordinates of sector 12. But even if you manage to get there, you will be shot at by the base's guards. Air space above sector 12 is also heavily restricted. Good luck if you want to find it. It will be available by version 0.0.4.