A worker polishes the surface of an unfinished miniature submarine at a workshop of Zhang Wuyi, a local farmer who is interested in scientific inventions, in Qingling village, on the outskirts of Wuhan, capital of central China’s Hubei province. Zhang has successfully tested his self-made miniature submarine “Shuguang Hao”, which is 12 feet long, 6 feet high, has a maximum diving depth of 65 feet, can travel at a speed of 20 km per hour for 10 hours underwater and is shaped as a dolphin. “I hope to sell my submarine as a civil product with the price of about 100,000 yuan ($15,670) after safety tests, and a merchant has decided to order one in this month”, Zhang said. (Jason Lee / Reuters)