If you've been to the level where you have to duck under a bunch of lasers, you know how frustrating it is. Well, here's a way to skip four lasers. First, press the switch against the wall that deactivates the laser lining the wall. Then, place a C4 right at the switch. Crawl under the first two lasers. A guy should come around the corner from behind you to deactivate the switch which is against the wall. Detonate the C4 so you don't have to go back through two lasers, then press the switch, then go back through those two lasers again.