Super-stealth sub powered by fuel cell From Frederik Pleitgen, CNN CNN's global series i-List takes you to a different country each month. In February, we visit Germany and look at changes shaping the country's economy, culture and social fabric. Eckernfoerde, Germany (CNN) -- It is almost totally silent, radiates virtually no heat and is constructed entirely from non-magnetic metals. Meet the U212A -- an ultra-advanced non-nuclear sub developed by German naval shipyard Howaldtswerke Deutsche Werft, who claim it to be "the peak of German submarine technology." And few would argue. The super-stealth vessel is the first of its kind to...