Rizhao Sky Diving Engineering is a commercial-diving and underwater-engineering company based in Donggang District of Rizhao, Shandong Province, on the southern stretch of Shandong's coast just south of Qingdao. The published service offering, as listed in the Maritime Business Directory under the company name, covers underwater hull cleaning, propeller polishing, divers, photographic inspection, CCTV and video survey, hull coating, blanking of sea chests and overboard discharges, installation of cofferdams, and replacement of transducers and speed logs. This range corresponds to the routine in-water work that classification societies require for in-water survey in lieu of dry-docking. The dataset records the company under the underwater-inspection service category and confirms in-water survey activity, with service-supplier approvals from ABS, BV, DNV, KR, LR and RINA cited for Rizhao Sky Diving Engineering, which is consistent with the broad multi-class scope typical of approved Chinese diving contractors working out of major Shandong ports. Rizhao itself is one of Shandong's main commercial ports, with the Port of Rizhao handling iron ore, oil and bulk traffic and providing steady local demand for class-approved in-water work on vessels calling at its berths.