Part 1 
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To found room with a rat robot and to press on the switch. 

To go in the control room. 
To take the gun. 
To use the computer 2 times (Only the screen of the center must be switch off). 

To go to the west of the sewers (after a large hole in front of 2 doors). 
To take the cord. 
To turn over to the screen after the rat robot. 
To use the cord to reach the grid and to leave the sewers. 

Part 2 
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To activate the switch in the small room but no the switch in a large room (trap). 
To activate the switch beside a robot on a trap door. 
To go to find JESSICA in the throne room. 

End of episode 8. 