Shanghai Penglang Underwater Engineering Co., Ltd. is based in Shanghai, the largest container port in the world and a major hub for international shipping at the mouth of the Yangtze River, hosting the Yangshan deep-water terminal, the Waigaoqiao container complex and extensive ship-repair facilities along the Huangpu River and surrounding anchorages used for crew change, bunkering and routine maintenance. The firm specialises in 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 Shanghai port area and at neighbouring Yangtze and East China Sea 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 damage assessment and thickness sampling where requested by surveyors and brief repair attendances including anode renewal and minor underwater works. Shanghai Penglang 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 Shanghai port area, at Yangshan and Waigaoqiao terminals and at the Yangtze River anchorages. Customers include shipowners, ship managers, surveyors and shipyards requiring objective documented evidence of hull condition on commercial vessels during routine port calls.