People look at the wreckage of a Second World War German warship in front of Djerdap II, a large dam on the Danube River, between Romania and Serbia, near Prahovo, Serbia (Darko Vojinovic/AP)Water levels on the Danube River, the second longest in Europe, have dropped so low because of drought that the hulks of dozens of Second World War German battleships are emerging into view. Historians say up to 200 German warships were scuttled in September 1944 near Prahovo in the Danube gorge as they came under Soviet fire. A man takes a photo on the wreckage of a Second World War German warship near Prahovo, Serbia (Darko Vojinovic/AP) (Darko Vojinovic/AP Photo/Darko Vojinovic)But Nazi Germany surrendered months later, in May 1945. A man walks on the wreckage of a Second World War German warship (Darko Vojinovic/AP) (Darko Vojinovic/AP Photo/Darko Vojinovic)Now, however, authorities are trying to keep traffic flowing on the Danube, which flows through 10 nations, as the dropping water levels create dangerous conditions. Krsta Brandic, a Prahovo resident, said the low water levels have almost stopped ship traffic, adding: “As you can see, the (big) ships can’t pass anymore.”