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A worker climbs up from Zhang Wuyi's newly designed unmanned submarine that captures sea cucumbers, during a test operation at an artificial pool near a shipyard in Wuhan, Hubei province, March 26, 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. (Photo by Reuters/Stringer)
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