Germany's rusting sea munitions are a toxic time bomb

Underneath the northern German waters lie vast amounts of wartime munitions slowly deteriorating. These remnants, estimated at 1.6 million metric tons, are scattered across the North Sea and Baltic Sea, the byproduct of conflicts from two world wars and the post-1945 disposal of surplus weaponry. Initially, these weapons were left undisturbed unless they posed an immediate threat.

However, as their metal casings corrode, a fresh concern has emerged. Many of these weapons were once remnants of battle, lost mines, unexploded bombs, and ammunition. Yet, a significant portion was deliberately sunk after the fall of Nazi Germany, with the Allies clearing Germany's extensive stockpile. What was once seen as an explosive hazard has now transformed into an environmental one.

Toxicologist Edmund Maser from Kiel University explained to Deutsche Welle, "Due to corrosion of these items, compounds enter the marine ecosystem and enter marine life, and it turned out that these compounds are toxic and carcinogenic, both for human life and also for marine life." Among the most hazardous compounds found in these old weapons is trinitrotoluene (TNT), a military explosive.

Researcher Jörn Scharsack from Germany's Thünen Institute of Fisheries Ecology discovered TNT in dab fish, though in minute quantities. While the levels are low, they consistently appear near old munitions sites. Despite the presence of TNT, fish appear healthy, without increased disease rates. However, researchers have observed tumors in the livers of fish around munitions dumping grounds, a phenomenon Maser's team has observed in over 50% of fish in these areas.

Mussels have also shown signs of oxidative stress from TNT exposure. The contamination extends beyond fish and mussels, reaching animals at the top of the marine food chain, including whales. While the presence of TNT-related compounds in humans through seafood is unlikely due to the occasional exposure, concerns arise as the munitions continue to deteriorate.

The corrosion of these munitions may exacerbate the issue, potentially reaching harmful levels for humans who consume seafood. The problem is exacerbated in the Baltic Sea due to weaker currents and water exchange, allowing pollutants to linger rather than disperse. Germany has so far removed munitions posing immediate danger but is now planning systematic clearance to prevent further environmental harm.

However, the challenge lies in the disposal and destruction of the recovered munitions, with around 1.5 million tons yet to be located in German waters. Researchers are exploring whether marine bacteria and fungi can eventually break down these residues into harmless substances. While this work is still in its early stages, experts emphasize the need for immediate action to prevent further contamination of the marine environment.