Complete section corresponding NSM
When descending, don't forget to switch back to the rocket launcher! It's still a lot better than any other gun. Start by walking a little to the right and hooking up. From here, you have to exterminate all the lasers. Shoot the laser (which stands for Light Amplification by Stimulated Emission of Radiation) down, then get up on the platform and shoot the next one as you fall.
Then get on top of that platform, walk to the right edge, then hook straight up and wait. A laser will come from the right. Blast it, then drop down. Fall off the right side, and blast the next one as you fall.
Then connect to the gray column, swing off, and then hook straight up onto the platform. Then get on the crate and swing off to the right, and hook straight up onto the small red platform.
Hook up to the top. Walk left, then hook up so you're at the position of the first picture. Swing off to the left, then keep swinging until you land on the red platform on the left. From there, keep hooking up. At the top, start going to the other side and falling down. At the bottom are spikes. Let the water blobs carry you. (There is another way... but it's worse.)
Then keep hooking up again, walk to the left, and start falling down. Swing over the crate by the communication door.
Go into the communication door, not to communicate, but for timing purposes. Get back out, and AS SOON AS YOU GET OUT, CHARGE LEFT. AND AS SOON AS YOU CAN REACH IT, SWING OFF THE COLUMN. If you do it correctly, you'll land on the sideways elevator. Once on it, duck under the spikes and walk off when it reaches the left side.
When you're on the gray column, fall off and walk left. Robots will attack. Duck and shoot them when they do. Keep going until you see a place where you can grapple up. Do so. If there's a robot there, run to the right until it's offscreen, then go back and try again. The action's pretty frantic around here, so go as fast as you can to preserve your health.
Once you have a chance to hook up, do so. Keep on hooking up until there's a door on your level. Go into it. It's the Pi Pi Pi defense mechanism. Piece of cake.