as a structural engineer I've investigated live sewer pipes (100 year old brick sewers, walking through with boots and a hard hat), looked at building facades (working on a swing stage 10+ stories high), worked in bucket trucks and basket lifts). Been to nuclear facilities, etc. permit-only confined spaces (in a 7ft diameter penstock with only the downstream gate between me and the river). Inside pipe where they're doing fiberglass overlays (the resins and volatile off-gasses aren't the most conducive to good health). There are a LOT of occupations that have some pretty serious safety and health risks. Try working with fiberglass on a daily basis or at anything dealing with aggregate like a mine/rock crusher (silicosis).