OK, natural gas utility worker here. Depending on the situation (workers in the video may be for electric, phone cable, or something else) there maybe 1 or 2 guys actually digging and a couple waiting around to do repairs on the line (welding, splicing cable, etc) and maybe one supervisor and a safety spotter. Years ago we were digging up a large gas main (20 inch line) and during that time a lot of new guys and management were there for training and safety. So, there were 2 guys in the pit doing the work and about 10-15 workers standing around watching them perform the work, and this was in a busy street. Numerous drivers went by us with their cell phones recording and actually complained to the company that there were bunch of people "just standing around" watching a few guys work when it was really a safety/training session for new people on the crew.