Photo: REUTERS
A worker paints a single-seater submarine designed by Zhang Wuyi and his fellow engineers at a shipyard in Wuhan, Hubei province May 7, 2012. Zhang, a 37-year-old local farmer, who is interested in scientific inventions, has made six miniature submarines with several fellow engineers, one of which was sold to a businessman in Dalian at a price of 100,000 yuan ($15,855) last October. The submarines, mainly designed for harvesting aquatic products, such as sea cucumber, have a diving depth of 20-30 metres, and can travel for 10 hours, local media reported.