Note: There isn't any secrets or Chests to find during this segment of the game, so just follow the path ahead.
When you wake up and regain control of Cal you'll notice you're in an unfamiliar place, in order to escape this disgusting cell you'll need to take a look behind you and use Force Pull on the wall to reveal some electrical wires, grab the wire and plug it in to the electrical box to open the door. Follow the path ahead until you reach a large open room and grab the electrical wire from the box in the back right and attach it to the panel near the entrance to open a door.
Go through the door and slide through the gap into another corridor and continue on to the right, now you'll want to grab another electrical wire and use it to swing yourself onto the platform above and then slot it into the electrical box to open the door which will allow you to drop down and save BD-1.
Escaping the Underground Jail
After saving BD-1 you'll need to find a way out of the underground jail. To begin, get BD-1 to slice open the door and then Wall Run across to the opposite side, continue along until you reach another door that BD-1 will need to slice open. You'll now find yourself in the large open room again, this time you'll need to grab the wire and plug it into the right of the box that powers the lift and then grab the wire from the left side and plug it into the left box.
All that's left to do now is to give the lift power, so get BD-1 to overcharge the electrical panel and take the lift up to find a Meditation Point. Now head into the arena to face a few waves of enemies. The first wave will include taking on an Oggdo, the second will include a Jatoz and Wyyyschokk, to take these out you'll want to split them up.
Boss: Mich Murda
After you've taken on all the previous enemies you'll face one last oppenent, Mich Murda. This boss will use the same attacks that you faced back in the Ice Caves on Zeffo. In order to defeat Mich you'll need to be ready to deflect any incoming bullets as well as his two powerful Red Attacks which include him slaming the ground or going in for a triple or single punch.
The easiest way to defeat Mich Murda is by using Force Slow and circling him to get a couple of hits from behind and then backing away. After you've defeated the opponenets you'll be rescued by the Mantis and leave Ordo Eris.