A quick search of the wounded Imperials reveals they carry standard Imperial blaster pistols. Curiously, none of them have any security gear at all - no pass cards, code cylinders, or key cards. Not even on the Imperial Guard. One other item of curiosity - all the royal guards look like twins. The Imperial Guard, however, looks different.
With the room secure, you head to the control console. It takes a moment to get the controls for the access hatch to the prison to open. When the massive hatch does retract, you see a dimly lit corridor lined with cell doors. The main lights are off, and there is a palpable cold flowing through the hatch. Oxygen levels are low, but you brought rebreathers, so you should be fine. Fitting them in place, you spark up some flashlights, and head into the prison.
As you move through the prison, you find every cell you come to is open and empty. Then you come around a corner and find several automated defence turrets set up, aiming at a particular cell. It is a simple matter to disable them. There were six of the heavy, quad-blaster turrets, all pointing at the door to cell 121A.
Moving to the door, you find it locked and sealed. It takes a few minutes with a vibroblade to get it open, but you manage it.
When you shine your lights in the cell, you see an old human female, wearing a skin-tight white jumpsuit, kneeling there with her eyes closed.
Logs tell you the environmental controls had been set low for several days - the woman here should be dead. But when the light touches her, her eyes open, and she draws a breath.
She speaks, but very slowly. "You have found me at last. I have been looking forward to this meeting for some time."
