Underwater Plumbers (Commercial Divers / Saturation Divers): These are highly trained professionals who perform plumbing, welding, cutting, inspection, and maintenance tasks underwater—usually on oil rigs, pipelines, ports, or dams. They’re not your everyday plumbers; they’re certified commercial divers, often called “saturation divers” or “inshore divers,” depending on the depth and environment. What They Do: • Install and repair underwater pipes and valves • Conduct inspections and maintenance