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If you're talking about the chasm where the motor is heating the pillar of concrete, after you defeat the robot that's spawned after you shock the motor, there is a outcropping on the right that has a ledge you can jump up and get on. At the far end of this platform, there is a place where you can force grip the pillar of concrete, causing it to fall and make a nifty little bridge across the gap.
i have done everything except how to figure what to do after i destroy the pillar then what im really having a hard time with this what gap are u talking about and what does it have to do with the burning bridge thanks