Zhang Wuyi looks up as he squats under a suction pipe of his new submarine that captures sea cucumbers at his workshop in Wuhan, Hubei province, March 25, 2013. Zhang, a 38-year-old local farmer who is interested in scientific inventions, has independently made eight 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) in 2011. The submarines, mainly designed for harvesting aquatic products, such as sea cucumber, have a diving depth of 20-30 metres (66-98 feet), and can travel for 10 hours, local media reported.