Qingdao Zhenghe Marine Engineering Co., Ltd is registered in Qingdao, the major Shandong Province port on the Yellow Sea coast that hosts container, crude-oil and bulk terminal complexes at Qianwan, Huangdao and Dongjiakou and a dense network of diving and underwater inspection service firms supporting the Yellow Sea trading lanes and the wider northern China fleet. The firm concentrates on underwater inspection scopes supporting in-water surveys of merchant tonnage in lieu of dry-docking, with diver-technicians dispatched to vessels at berth and anchorage in the Qingdao port area and at neighbouring Shandong terminals. Diver-technicians carry out close visual examination of hull plating, sea chests and gratings, bilge keels, propellers and propeller blades, rudders and rudder bearings, anode wastage, stern frames, bow thrusters and other below-waterline items, with video and photographic documentation prepared in formats accepted by attending classification surveyors. Routine deliverables include detailed in-water survey reports supporting class periodical, intermediate and special surveys carried out under SOLAS and class rules, alongside thickness sampling and damage assessment where requested by surveyors and brief repair attendances such as anode renewal and minor underwater works. The team works with surface-supplied diving equipment, underwater video systems and ROV-assisted inspection arrangements as required by site conditions and visibility. Qingdao Zhenghe holds service supplier recognition by DNV and the Korean Register, allowing in-water survey reports to be considered during class survey programmes on tonnage attended in the Qingdao port area, at Yellow Sea anchorages and at neighbouring Shandong terminals during routine commercial calls.