I've been looking at the video. I posted a comment on youtube with the translation of the poster's comment and what is said in the video. In the poster's comment it says this was taken during the construction of the toll highway Mexico City to Tuxpam, which is on the Gulf coast, and that the operator was from Huauchinanga, and that he died shortly after the accident.
The operator was senior to the worker taking the video, at the beginning he is explaining to him how to record it, and tells him not to stop until he has reached the bottom (which he didn't...) The second worker kept telling him to go down, that passing that point he could go down.
Like i say on my comment there, construction workers in Mexico are a very tough bunch and are always taking risks, often needlessly. Often they egg each other on to do things that are dangerous, like the worker who was taking the video did. A company big enough to have a contract for a toll highway normally has fairly good safety protocols, but smaller companies are often negligent.
Thanks for telling me about the video. What a shame...