Shenzhen Huihai Dive Engineering Service Co., Ltd. is a commercial diving and underwater services contractor based in Shenzhen, in the western Pearl River Delta. The company concentrates on class-attended in-water work for merchant vessels and offshore assets calling at the ports of Shenzhen, Guangzhou, Hong Kong and adjacent anchorages, where commercial divers undertake hull, sea chest, rudder, propeller and thruster examinations together with cathodic protection checks, marine growth assessment and propeller polishing. Underwater inspection in lieu of drydocking is supported through video and photographic recording packages prepared for direct submission to attending classification surveyors. Diver teams also perform hull ultrasonic thickness gauging and hatch cover ultrasonic tightness testing on board, allowing structural plate-thickness reporting and watertight integrity checks to be combined with subsea scopes during single ship calls. Watertight integrity testing extends to weather decks, cargo holds, ballast tank boundaries and door arrangements, with technicians issuing acceptance reports that follow IACS and SOLAS practice. Operations align with classification society procedures for diver-based examinations, and the firm is recognised within the directory of suppliers approved by CCS, which positions Shenzhen Huihai Dive Engineering as a regional vendor for short-notice underwater jobs and periodic surveys around the Pearl River anchorages. Reporting is bilingual where requested, and dive supervisors coordinate with port agents, owners' superintendents and shipyard project teams to schedule jobs around tide windows, cargo operations and bunkering, reducing time lost on routine and unscheduled hull interventions in southern Chinese waters. Equipment ranges include surface-supplied diving spreads, hookah units, helmets with through-water communications, hydraulic and pneumatic tools for fastener removal and minor underwater repair, and digital underwater video and photographic kit, supporting fast turnaround on routine inspection tasks for owners, managers and shipyards.