Europe's summer of extraordinary heat and drought has pushed some of its rivers to record lows, revealing long-submerged relics from ancient bones to century-old shipwrecks. The remains of what historians believe is an ancient mammoth near the village of Ryahovo, Bulgaria. Advertisement AdvertisementAnd in Serbia, the shrunken river has exposed the remains of a sunken Nazi warship. The wreck from 1937 of the Hungarian cargo ship Fulton in the Danube River near Opatovac, Croatia, July 24, 2026. "The heat dries the soil, empties the rivers and drives up demand for water all at once.