Yantai Deep Water Oceaneering Inspection Service Co., Ltd. is a commercial diving and underwater inspection contractor based in Yantai, Shandong Province, supporting merchant vessels, offshore support craft and infrastructure owners using the northern Yellow Sea and Bohai Bay port system. Diver teams undertake in-water examinations of hull, sea chests, rudders, propellers and thrusters together with marine growth surveys, cathodic protection checks, propeller polishing and minor underwater repair, with reports documented through video and photographic packages prepared in formats familiar to attending classification surveyors. Underwater inspection in lieu of drydocking forms a core line of work for bulk carriers, tankers, container vessels, offshore support units and specialist craft trading through Shandong and Liaoning ports. Non-destructive testing and condition monitoring scopes complement subsea work, with qualified technicians performing ultrasonic, magnetic particle, dye-penetrant and visual examinations on hull structure, weld assemblies, lifting gear and small marine fabrications during repair and special survey programmes. Yantai Deep Water Oceaneering Inspection Service operates within the directories of recognised service suppliers maintained by CCS and DNV for in-water survey and NDT categories, giving owners trading internationally a Shandong-coast contact for coordinated diving and inspection campaigns. Operations are scheduled around tide windows, cargo plans and bunkering to minimise time lost on routine and unscheduled hull and underwater interventions in busy northern Chinese anchorages and repair quays. Equipment ranges include surface-supplied diving spreads, helmets with through-water communications, calibrated ultrasonic thickness gauges, ultrasonic flaw detectors, magnetic particle yokes and digital underwater video and photographic kit, supporting fast turnaround on routine and unscheduled inspection tasks across the Shandong port system and adjacent offshore oilfield support areas.