Fuzhou Derui Underwater Engineering Co., Ltd. traces its origin to a diving team that began contract work in January 2003 with the Fuzhou Rescue Base of the East China Rescue Bureau under the Ministry of Transport, providing emergency response divers to the bureau's rapid-reaction unit. The company was formally established in 2005 in Fuzhou under its current corporate identity, having previously operated under the trading name Donghai Diving Engineering Co., Ltd. before reorganisation. General manager Liu Shuren leads day-to-day operations, with a twenty-four-hour duty line answered through the Fuzhou exchange and correspondence handled via the lsrfz mailbox on 163.com. Service capability covers compressed-air and mixed-gas diving for salvage and wreck recovery, hull inspection while afloat, fault location and clearance of fouled propellers and intakes, compartment sealing and emergency leak plugging, and underwater video survey of dams, reservoirs, hydropower intakes and pier structures. Specialist crews also undertake channel sweeping and obstruction clearance, underwater blasting, wet welding and oxy-arc cutting, photographic recording, and non-destructive testing of submerged plating and welds. Cable-laying teams install and maintain submarine communication and power cables, and the diving unit takes on customised tasks for marine engineering contractors along the Fujian coast. Recognition by the China Classification Society places Fuzhou Derui among the authorised service stations performing in-water survey work for classed merchant vessels in the region. (217 words)