You need the Helipack: go to where there are all of the force fields, where you can see the gold bolt behind one of them. Go farther where there is the round platform that the steam pushes in the air. Jump on it and once the platform goes up, jump on the closest pillar where the force fields are attached. Make your way to the pillar next to the gold bolt and jump off to get it.
You need the O2 Mask: first, get to the place where you had to run as fast as you could to get the most oxygen where everything flooded up. When you get there, it will still be flooded. Follow the path and when you get to the place where you can go higher on a platform on the left, go the other way (right, and down). Follow the path in a tunnel and when you get out of the water, the gold bolt is there.