Activate the ventilation shaft in the control room (at the very top of the detention complex, with that large glass/metal tube in the middle of the room.
(There are two buttons, one released the prisoners, the other is for the ventilation shaft.)
Now jump into the ventilation shaft and the air will slowly lift you to the bottom. Try to move towards the grate, which is lying half-way in the shaft. If you miss it, you will be sucked into the blades at the bottom of the shaft.
Take this, Jedi! Oh, no. What am I saying!