The extraordinary discoveries come as prolonged heat and drought grip large parts of Central and Eastern Europe, causing severe declines in river levels, disrupting shipping, tourism and even electricity generation in several countries.Nazi warships emerge from the Danube Near the Serbian town of Prahovo, receding waters have exposed several German military vessels deliberately scuttled by retreating Nazi forces in 1944. Many of these wrecks are believed to still contain unexploded ammunition and explosives, making them a continuing safety hazard for both navigation and salvage operations.The exposed ships are part of a much larger underwater graveyard in the Danube. European authorities have...