Navigating the prison
After making your way inside Skethermoor Prison, you want to avoid any guard you can, but early on, you’ll just find one or two of them sitting inside separate rooms. Loot the rooms if you want, but keep descending down any stairs until you reach a locked, vault door.
Off to the side of this door is a control room where you can find a button to push in the center of an electronic console. Pushing the button allows you to go through the door and inside the cell block area of the prison.
In the cell block area, you start on the top level and have to eventually work your way down to the ground floor. There are a few guards on patrol, and a large robot is walking through the center hallway on the bottom floor. Deal with the guards and then head down to the ground floor, avoiding the robot at all costs. Off to the side in the middle part of the ground floor, you’ll find a control room. Push the button on the console in front of the control room to enter it.
The control room itself isn’t too important, but it allows you to access new parts of the prison. Head out one of the doors in the control room to find a hallway, where one or two guards are on patrol. Kill or avoid the guards and then look for a room labeled “Bunk Room.” It shouldn’t be too far from the control room.
In the Bunk Room, loot the “Security Keycard” lying on the central table and make your way back to the cell block area. Avoiding the robot, go to the large vault door on the other end of the room from where you came in, insert the Security Keycard into the slot to the right of the door, and then go through it.