An employee was helping a sheet metal foreman measure a small sheet metal roof over the dock. The employee walked onto the sheet metal roof and fell through a flush skylight on the canopy. He fell 16 feet, landed on some 55-gallon drums, bounced, and ended up on the dock concrete flooring. He was hospitalized with broken ribs, broken vertebrae, a punctured lung, an injury to the other lung, and a damaged spleen.