Shenzhen Marine Diving Engineering Co., Ltd, known as SMDE, is a commercial diving and underwater engineering firm based in Shenzhen on the Pearl River Delta, serving vessels calling at Shekou, Yantian, Chiwan and other South China terminals as well as offshore facilities across the region. Diver-technicians carry out underwater hull cleaning using brush kart systems, propeller polishing, sea chest and overboard discharge blanking, underwater welding and cutting, salvage and wreck removal, ROV-assisted survey and recovery work. For classification-driven scopes, divers perform in-water surveys of hull plating, sea chests, propellers, rudders, anodes and other submerged items, supported by photo and video documentation prepared in formats accepted by attending surveyors and used as alternatives to drydocking under approved class procedures. Hull ultrasonic thickness gauging campaigns conducted by trained operators provide hull steel renewal data, while ultrasonic hatch cover testing and watertight integrity testing cover weather deck closures, cargo holds and bulkheads. Non-destructive testing and remote inspection scopes complete the structural inspection package. Shenzhen Marine Diving Engineering holds service supplier recognition under ABS, BV, CCS and DNV for relevant categories, supporting acceptance of reports during in-water surveys and class survey attendance. The team operates from Shenzhen with dive-control vans, surface-supplied diving systems, ROVs and supporting boats deployed to vessels at berth, anchorage or on passage through the Pearl River Estuary. Customers include shipowners, ship managers, repair yards and offshore operators that require timely, documented underwater attendance on commercial and offshore tonnage trading through southern Chinese ports and adjacent waters of the South China Sea.