Shanye Marine Services Co., Ltd. is a marine and underwater engineering firm jointly established in 1995 by Shenzhen Huawei Offshore Shipping and CNOOC Energy Development, with operations supporting offshore oil and gas activities, ship voyage repair and commercial shipping clients in southern China. The team specialises in offshore mooring and oil extraction support, ROV operations, commercial diving and ship-side technical services, with a documented record of more than 6,000 oil-extraction attendances and over 500 underwater engineering projects across the South China Sea. Within the commercial shipping segment, diver-technicians perform in-water surveys of hull plating, sea chests, propellers, rudders and other below-waterline items, with video and still imagery and survey-grade reporting that supports classification society in-water survey requirements as alternatives to drydocking. The underwater engineering unit also handles design, installation and maintenance of subsea facilities, underwater measurement, salvage and remotely operated vehicle deployment, while ultrasonic thickness gauging, ultrasonic hatch cover testing, watertight integrity testing and NDT campaigns are performed on commercial tonnage. Shanye Marine Services Co., Ltd. holds service supplier recognition under ABS, BV, CCS and DNV for relevant inspection categories, supporting acceptance of reports during periodical, intermediate and special surveys. Customers include CNOOC, BP, Chevron, ConocoPhillips, Eni and other Chinese and international operators. The Shenzhen-based parent structure draws on offshore vessel fleets and diving teams that mobilise to Pearl River Delta ports and South China Sea oilfields for both commercial vessel work and offshore engineering campaigns across the region.