repairer working inside the confined space at mean time connecting back up safety rope with three two one pulleys system

access area atmosphere back background black building closeup concept confined connecting construction control danger design equipment green harness heavy helmet his incident industrial industry inside isolated light machine man manhole mean mine miner mission nature occupation one outdoor people person personnel plan plant precaution preventing prevention professional protection pulleys repairer rescue restricted rope safety site sky solution space spotter system texture three time two worker workers working