Official text extracted from Panzer Dragoon Saga.
This aquatic base is protected by two retractable walls. Lookouts, spotlights, and guards are posted inside each wall. Special care must be taken to protect the Control Tower, located in the center. (see next page)
Imperial Base Diagram
The inner walls surrounding the Control Tower remain closed. These walls only open while taking in supplies or during a Red Alert to allow reinforcements to attack.
When our defense capabilities have been severely compromised, troops from behind the inner wall will advance to defend the Control Tower. Beware, the Control Tower may be under attack from intruders if this emergency occurs.