Dong-Di Marine Trading & Service Co., Ltd. is a Nantong-based technical services provider that supplies inspection, testing and maintenance to ships calling at Chinese ports and shipyards. The office is located in the High-Tech Development Zone of Tongzhou District, placing the company within reach of Yangtze River shipyards as well as ports along the Jiangsu and Shanghai coastline. The firm is listed as a recognised service provider by the Bahamas Maritime Authority and holds approvals from IACS classification societies for its core scopes of work, supporting Chinese and international owners during scheduled class renewals and intermediate surveys. Life-saving appliance servicing is a longstanding line of business, with a dedicated Lifeboat Service Department established in 2020 carrying recognitions from Lloyd's Register, DNV, ABS, Bureau Veritas, RINA and ClassNK. Annual and five-year special examinations are performed on lifeboats and rescue boats, davits and launching appliances, winches, release hooks and associated falls, along with liferaft servicing co-ordinated through approved stations. Lifting appliance and gear surveys for cranes and provision-handling equipment round out the deck-equipment scope. Hull and tightness testing complements this safety work. Dong-Di Marine Trading & Service Co., Ltd. technicians carry out hull ultrasonic thickness gauging for class renewal surveys, ultrasonic hatch cover testing and watertight integrity checks on bulkhead doors and weather closures, in-water surveys with NDT documentation and other remote inspection assignments using cameras and ROV equipment where access is restricted. The combined offering allows owners and managers to consolidate several mandatory recurring services with a single supplier during a single port call, useful for tight turnarounds on bulk carriers and container vessels trading through the Yangtze Delta region.