The Dutch Sector Hyperbaric Labour which includes diving, caisson and hyperbaric medical treatment has the status “risk full” sector. Hyperbaric Labour is usually carried out at locations that by definition do not represent a natural environment for humans. Working in a liquid or in a dry diving bell is only possible if the operator has a supply of breathing gas. Conditions such as poor visibility, cold temperatures and water current all add to the hazards, and it is for these reasons that diving work is regarded as risk-full. Risks that could lead to personal (himself, his team), economic, environmental damage and even threat to public order and safety.