Chinese farmer makes splash with homemade submarine

A 60-year-old farmer in China has built his own "Big Black Fish" -- a homemade submarine that can accommodate two people, dive eight metres and stay underwater for 30 minutes at a time.Years later, after spending another 40,000 yuan on a new hulking steel structure, pouring two tons of concrete into the bottom of the submarine, and adding two ballast tanks, Zhang's Big Black Fish was ready for sea trials.