A diving helmet is a crucial piece of equipment used in underwater diving. It provides divers with a supply of air while protecting their heads from water pressure and environmental hazards. Typically made from metal or strong plastic, the helmet is designed to keep water out and maintain a stable air supply, allowing divers to explore underwater environments safely. Diving helmets are often used in commercial diving operations, where divers work at significant depths. They are connected to a surface air supply system, which delivers breathable air through a hose. This setup is essential for deep-sea exploration and underwater construction, making it a vital tool in the field of marine engineering.