Retired, The lower south exit is perfect to get to the panel and do the 3 segments.
And do not forget to do those Button Panels.
Go to the Control panel aside the Round building and set the mechanism down and right.
Also, you must go to the Lower east Exit to do more Button Panels. This will bring you to the 4 Way Tower, your next objective.
When you get there, the lake MUST be full of water.
And before you start that section, 4 actions must have been done :
-turned on the antenna
-closed the door with 3 stars at the Door Complex at the Pumping station
-noted the positions of the 3 segments
-activated 8 button panels.
Have fun my friend.