Safe Work in Confined Spaces   Voice-over: Here could be methane, hydrogen sulphide and other toxic gases in confined spaces like manholes and sewers. Before starting work, it's necessary to conduct a risk assessment and air testing by a competent person   Competent person: The person in charge must carry out all my recommendations on safety precautions before issuing a safety certificate to start work.   Worker D: The ventilation system is set!   Worker C: The protective equipment is ready!   Worker D: We're watching outside!   Worker C: Only trained and certified workers can work inside confined spaces.   Voice-over: Confined spaces can be risky Take all safety precautions   Endsuper: Confined spaces can be risky Take all safety precautions Enquiries: 2559 2297 www.labour.gov.hk