Invented in the Tang Dynasty and widely adopted after the Song Dynasty in Fujian, the watertight-bulkhead(水密舱壁) technology permits the construction of ocean-going ships with watertight compartments(隔层). If one or two cabins are accidentally damaged at sea, water will not flood the other cabins and the ships will remain afloat.
The experience and working methods of watertight-bulkhead technology are transmitted orally from master to apprentices. However, the need for Chinese junks(中国式帆船) has decreased sharply as wooden ships have been replaced by steel-hulled ships, and today only three masters can claim full command of this technology. Associated building costs have also increased owing to a shortage in raw materials. Therefore, the inheritance(继承) of this heritage is decreasing, and inheritors are forced to seek alternative employment.
Zhang Guohui, a 77-year-old inheritor of the watertight-bulkhead techniques used to make Chinese junks, has been making ships for more than six decades. Coming from a poor family in a fishing town in East China's Fujian Province, Zhang started to make a living at the age of 16fishing on the open seas, which is where he developed a keen interest in constructing boats. As a fast learner, Zhang was later sent to shipyards in the cities of Quanzhou and Xiamen in Fujian Province, where he received training and became a master of traditional Chinese junks and gained fame because of his extremely skilled craftsmanship in the construction of these junks.
In fear that the traditional skills would die someday, Zhang started to restore old ships and make model junks for the museum with his 20 years of shipbuilding skills. "The restored ancient ships are the historical witnesses of Quanzhou as a maritime center of the East and Southeast Asiatrade network," said Zhang, adding that he finds the work meaningful since younger generations can learn from exhibitions of ancient ships that their ancestors had advanced shipbuilding technology at an early stage of development. "As long as I'm alive, I'll keep passing on the heritage," he said.