Switzerland’s picturesque lakes, known for their crystal-clear waters and stunning alpine backdrops, conceal a hazardous legacy beneath their surfaces. Between 1918 and 1964, the Swiss military disposed of over 12,000 tons of outdated or surplus ammunition by dumping it into lakes such as Lucerne, Thun, Brienz, and Neuchâtel. Believed at the time to be a safe disposal method, these munitions now pose environmental and safety risks, including potential water contamination and the threat of explosions.
In response, the Federal Office for Defence Procurement (armasuisse) has launched a competition to find environmentally friendly and safe methods for retrieving these munitions. The initiative is open to researchers, industry experts, and innovators, with a total prize of CHF 50,000 ($58,325) to be awarded to the top three submissions. The deadline for entries is February 6, 2025, with the winners to be announced in April 2025.
The challenge of recovering these munitions is considerable. Most of the ammunition lies at depths of 150 to 220 meters, buried under up to two meters of sediment. Any recovery operation risks disturbing these sediments, which could harm the lakes’ ecosystems by depleting oxygen levels and releasing toxic substances like TNT into the water. The munitions, which vary in size and composition, further complicate the recovery process due to their varying materials and the presence of explosive fuses.
An assessment in 2005 highlighted the risks of disturbing the sediment and concluded that existing recovery methods posed significant environmental hazards. As a result, armasuisse’s competition is not intended to lead to immediate salvage operations but to generate ideas that could form the basis for future research and potential solutions.
The recovery of these munitions is expected to be a multi-billion-dollar endeavor, only to be undertaken if monitoring reveals a serious environmental threat. For now, the Swiss government is taking cautious steps, prioritizing the exploration of safe and sustainable recovery methods.
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