Last year’s oil spill in the Gulf of Mexico drew attention to the use of underwater robots, more properly called remote-controlled vehicles, that served as the eyes and hands of operators above as they struggled to fix the leaking wellhead far below on the sea floor. Some 800 underwater robot enthusiasts from around the world came together recently in Houston for a competition at the Johnson Space Center's buoyancy laboratory where NASA trains its astronauts in a simulated weightless environment.  VOA's Greg Flakus was there and filed this report.