The worst drought in Europe in decades in Serbia has not only affected agriculture. It has also revealed almost forgotten relics of World War II in the shape of German battleships emerging from the Danube.

The ships, some still laden with munition, belonged to Nazi Germany's Black Sea fleet that was deliberately sunk by the Germans as they retreated from Romania as Soviet forces advanced.

The unusually hot weather across Europe this summer -- which scientists have linked to global warming -- and other factors have affected the Danube, Europe's second-longest river that flows through 10 nations. Authorities in Serbia have used dredging to keep vessels moving.

Historians say up to 200 German warships were scuttled in September 1944 near Prahovo in the Danube gorge known as The Iron Gate on the orders of the fleet's commander as they came under heavy fire from the Soviets. 

The idea behind the deliberate sinking was to at least slow down the Soviet advance in the Balkans. But it didn't help as Nazi Germany surrendered months later, in May 1945.

The wrecks appearing from the depths are an impressive sight, but they have caused decades of trouble for those using the river, and now the Serbian government, with EU support, is planning to do something about them.

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