Archaeologists in Austria have uncovered what may be the largest collection of ancient iron ever found in Europe—over 500 iron bars, likely lost in a shipwreck in the Danube River about 2,200 years ago. The discovery was made in 2019 during gravel extraction near Deinham, when workers noticed unusual double-pointed iron objects and reported them to the Austrian monument authority. These bars, now referred to as a "rusty treasure," are considered significant enough to have equipped an entire army. The iron bars date back to the third to second centuries B.C., during the Late Iron Age La Tène period, a time known for advanced metalworking and trade across Europe. The study, published in the journal Antiquity, was led by Peter Trebsche of the University of Innsbruck and Marion Berranger from the University of Technology of Belfort-Montbéliard in France. From the hundreds of iron fragments recovered, they identified 193 complete bars and 307 partial ones, totaling at least 500. The complete bars averaged around 11.2 inches (28.5 centimeters) in length and weighed about 4.5 pounds (2 kilograms) each, with the total collection weighing approximately 2,200 pounds (1 metric ton). The iron bars were semifinished products, often called ingots, used as raw material for blacksmiths to create tools, weapons, or other items. According to Trebsche, the iron found in Deinham could have been used to forge around 500 swords or up to 8,000 iron nails. This suggests the iron was being transported down the Danube River for trade, highlighting the sophisticated inland shipping systems of prehistoric Central European societies. Unfortunately, the original context of the find was lost due to the gravel extraction process, making it difficult to determine how the metal ended up in the river. While the possibility of ritual placement cannot be ruled out, most research on similar river finds suggests these iron bars were likely lost during transport. The bars may have been produced upstream, possibly in Bavaria, as similar iron bars have been found in Manching, Germany, about 125 miles (200 kilometers) away. Researchers are now analyzing chemical traces in the bars to confirm their exact origin. "It is incredible that such a large quantity of iron was transported at once and was available in a single exchange transaction in the Late Iron Age," Trebsche remarked. "This finding demonstrates the increased capacities of iron production achieved in the third and second centuries B.C. in the Danube region." The discovery offers valuable insight into the scale of trade and metal production during this period, shedding light on the economic and technological advancements of ancient European societies.