I had never heard of "En el hoyo" (called "In the Pit" in English) when I turned it on. It sure impressed me. Focusing on some construction men working on an enormous freeway in Mexico City, the documentary really hits you. It shows how these men do this so as to support their families, but always maintain their sanity and, above all, a sense of humor (one man entertains himself by looking up the dresses of women in passing cars). The men talk about terrible things happening in the building process, but understand that this is their only option.
It's worth noting that this documentary is not a polemic. It shows a grim topic while letting the audience make their own decisions. The end shows one long shot of the freeway, forcing the audience to wonder something: given what the interviewees talked about, how often have similar things happened during the erection of this thing? Not to mention that Mexico City's already foul air will probably get even worse with more freeways.
Anyway, I recommend it.