People watch the wreckage of a WWII German warship, emerged due to the drought, in front of Djerdap II, a large dam on the Danube River, between Romania and Serbia, near Prahovo, Serbia. AP Photo/Darko Vojinovic) PRAHOVO: Water levels on the Danube River, the second longest in Europe, have dropped so low because of drought that the hulks of dozens of World War II German warships are emerging into view.They are a curious distraction from the summer heat crisis. The Danube's record low water levels also have forced power plants to the brink of shutting down, and governments across Central...