YAS Diving Engineering Co., Limited is a commercial-diving and underwater hull-inspection contractor that has been servicing vessels since 2014, with operations referenced in the Yantian district of Shenzhen, the Longgang District and in Guangzhou. The firm supports merchant tonnage calling at the Pearl River Delta ports of Guangzhou-Nansha, Huangpu, Shenzhen-Yantian, Shekou, Zhuhai-Gaolan, Dongguan and Foshan as well as the Hong Kong anchorages. The technical scope is centred on class-accepted in-water surveys in lieu of drydocking, covering CCTV-recorded close-up examination of plating, weld seams, sea chests, rudder pintles, propeller, stern frame and bottom shell, together with underwater hull cleaning by mechanical brush-cart, in-water propeller polishing, underwater bolting, cropping, cutting and welding, and complicated underwater repair scopes carried out by surface-supplied divers. Additional in-water work includes ultrasonic hatch cover tightness verification on accessible cover panels, hull ultrasonic thickness gauging delivered through diver-deployed gauges, and watertight integrity testing support during repair-period surveys. YAS Diving is recognised by ABS, Bureau Veritas, DNV and Korean Register as a service supplier for in-water survey and underwater repair categories, allowing diving inspection reports to be submitted directly for class confirmation of underwater hull condition on vessels flying flags that recognise these IACS members. The dive teams operate to recognised commercial-diving codes with on-site supervisors, dedicated standby divers and surface-supplied breathing systems. Field attendance is scheduled around cargo operations and short port stays so that owners and managers can close hull-renewal, special and intermediate survey items without dedicated drydock time, supporting voyage-by-voyage compliance with class and statutory periodicities.