Record-low water levels in the Danube River have exposed around 20 World War II-era German shipwrecks near Prahovo in eastern Serbia. The vessels were deliberately sunk by retreating Nazi forces at the end of the war and have now resurfaced as drought conditions worsen. The wrecks are restricting navigation on Europe's second-longest river, while low water levels have also affected hydropower generation, triggering concerns over Serbia's energy supply. The dramatic sight has meanwhile attracted tourists eager to see the long-hidden relics of history.