Skipping Helicopter Battle in Surface Tension (Black Mesa)
Channel: EnRIz27
Date: 2012-09-15

So basically, there is this huge skip in the original Half-Life where you with a combination of mapswimming and surfing can skip the helicopter battle in the beginning of the chapter "Surface Tension".

I was curious to if the creators of Black Mesa stayed true to the original, and I managed to reproduce the trick. This trick is mostly used by speedrunners but since this one's really easy, everyone can do it.

This video is basically showing that it's possible, not the details of "how" it actually works. I guess there is a Block that triggers "death with fall" but I have to check the map out in Hammer to actually be sure about it.