CF Biochemical Hotel Why can others squat under the signboard and I can't?

You didn't get completely stuck in the "half squat" when you posted it. I have a homemade method: at the corner card near the bridge, the card fell down (the pool) several times, but you can see the "underground". At this time, you only need to press jump (space) to release all the keys, and then move to the tree. When you get to the tree, you can press ctrl, and you can go down (of course, that sign can also be squatted).

That cage is stuck in technology. If the technology is ok, a person can go down.