About midway through the level you will be faced with rotating two sections of platform (we’ll call them platform A and B) to sides 1, 2, or 3. In order to ‘clear’ each platform you need to charge up a Pylon with a Charge Cube on each of the platforms for each of the numbered sides (Line up platform A and platform B with the same number until you complete both platform A and B, then rotate both to new numbered sides and they must match). When you charge up the correct station you will see a cutscence of a light turning green or a gate opening (depending on which platform and side it is). If you are not sure that you have done a side, go back to the tower and check the section control station. Completed sections are green, uncompleted sections are red. Once you complete all 3 sections of both platforms the secret area will unlock.