Seastars Marine Services is a Nantong-based contractor focused on environmental compliance and condition-related services for commercial shipping using the lower Yangtze River. The firm is recognised by ABS, ClassNK, DNV and Korean Register, giving its technicians access to a broad cross-section of internationally trading tonnage. Service activity centres on ballast water treatment system commissioning, attendance during initial start-up tests and routine service of installed BWTS units, supporting owners as they manage compliance with the IMO Ballast Water Management Convention. Seastars Marine also undertakes inventory of hazardous materials surveys and IHM maintenance work in line with the Hong Kong International Convention for the Safe and Environmentally Sound Recycling of Ships and the EU Ship Recycling Regulation, helping operators keep IHM documentation current through a vessel's working life. Underwater inspection in lieu of drydocking rounds out the portfolio, providing class-acceptable video and written reports for selected bottom survey items. Working from Nantong places the team within reach of the major shipbuilding and repair clusters of the lower Yangtze and the anchorages used by tonnage transiting to Shanghai and the East China Sea. Procedures follow IMO instruments such as the BWM Convention and the Hong Kong Convention, supplemented by class guidance notes for service supplier work. Personnel qualifications and equipment calibration are maintained in line with the approving societies' requirements for environmental and underwater services. Seastars Marine coordinates BWTS, IHM and in-water attendances with class surveyors and ship managers so that environmental and condition-related items can be addressed within a single mobilisation where the schedule allows. Records of BWTS commissioning data, IHM sampling and analysis results and dive logs are retained for traceability, and reports are released in English where required for international clients managing fleet-wide compliance programmes.