Maisy Batteries Episode: A mysterious map marked ‘area of high resistance’ leads military collector and amateur historian Gary Sterne to an empty farming field not far from Omaha and Utah beaches. But there’s nothing there – that is until Gary begins to dig and explore. Now, nearly seven decades after D Day, a massive Nazi artillery base, the size of four football fields, poses hard questions for WWII experts. Why did the Germans build this particular base is such secrecy? How did it continue to fire for three terrible days after the initial beach landings? And most importantly; why was it buried and lost to history?