Construction workers in Germany digging along the North Sea’s rugged coast discovered a massive World War II relic painted with evidence of its dark past. According to archaeologists in the district of Cuxhaven, about 58 miles northwest of Hamburg, experts recently excavated a nearly complete Sturmgeschütz III (StuG III) assault vehicle. The remnants of this formidable tank have been buried in the sand beneath the Nordholz naval air base for ove…