Founded in 2008 and headquartered in Shanghai, Shanghai Ruiyang Marine Technology Co., Ltd. provides technical services to the shipping and offshore sectors with a focus on underwater engineering and marine structural inspection. Day-to-day work covers diving operations, marine surveying, underwater welding and cutting, propeller polishing, hull cleaning, and wreck removal, supported by ultrasonic thickness gauging and watertight integrity testing on hatch covers and shell plating. The company also takes on integration projects involving mechanical and electrical equipment, computer systems, and environmental engineering, alongside the production and sale of related electronic products and import-export trade in goods and technology. A separate technology arm handles development, technical consulting, technology transfer, and general engineering services, allowing the firm to combine hands-on diving work with applied research. Over the years the team has filed roughly 26 patents tied to inspection methods, diving equipment, and underwater repair techniques, reflecting an investment in proprietary tooling rather than purely sub-contracted labour. Class society approvals from CCS underpin the testing scope, and recurring work covers ships in lay-up, drydocking surveys, and emergency repair calls. Ruiyang draws clients from local owners, repair yards along the Yangtze estuary, and Chinese-flag operators that need quick mobilisation of certified divers and NDT technicians for class-driven inspections and post-incident assessments at berth or anchorage.