Think your underway life is tough? How about having to build you own sub and race it under your own power? From June 27 to July 1, teams of students, clubs and companies from around the world will be converging on a Navy testing pool in West Bethesda, Md. to race their home-made subs through an underwater course. The 11th International Human-Powered Submarine Race, to be held at the model basin at the Naval Surface Warfare Center, Carderock Division, aims to challenge and inspire the next generation of engineers. One of the contestants is the Scubster, a pedal-propelled sub…