12,000 Fish Airlifted in Major Swiss River Environmental Operation

A staggering 12,000 lives hang in the balance above the Swiss National Park. In a conservation effort of massive proportions, helicopters are currently thundering through the Engadine valley, executing a precision airlift to save thousands of river trout from the Spöl River. This is not a drill; it is a critical evacuation. The operation, centered at the foot of the Punt-dal-Gall dam, represents one of the most significant logistical interventions in the park's 111-year history.

Teams of specialists are racing against the clock to net and transfer the fish into specialized containers, which are then flown downstream to safety. This dramatic intervention is the necessary precursor to a total environmental reset. The scale of this mobilization—involving around twenty experts and heavy aviation support—underscores the severity of the situation. We are witnessing a desperate bid to preserve the aquatic population before the riverbed is turned into a construction site. The message is clear: the ecosystem comes first, whatever the logistical cost.

For nine years, the Spöl has grappled with a silent, invisible killer. The riverbed is laced with carcinogenic polychlorinated biphenyls (PCBs)—a toxic hangover from a maintenance disaster in 2016. While maintenance work on the dam wall was intended to secure infrastructure, it inadvertently unleashed a chemical scourge that contaminated a critical five-kilometre stretch of pristine water. These substances, formerly used in paint and insulation, have embedded themselves deep into the sediment, threatening the entire food chain.

The cleanup targets are ambitious and non-negotiable. Ruedi Haller, Director of the National Park, has set a definitive goal: extracting 90-95% of the PCBs from the sediment. This is a surgical strike against pollution in one of Switzerland's most protected regions. The contamination didn't just dirty the water; it compromised the ecological integrity of the park itself. Now, nearly a decade later, authorities are finally moving from assessment to eradication, determined to scrub the riverbed clean of its industrial poisons.

The logistics of this operation are nothing short of extreme engineering. To access the poisoned sediment, engineers must literally stop the river. Giacum Krüger, Director of the Engadine electricity company EKW, confirms that water levels have already been drastically lowered to facilitate the fish capture. But the boldest move is yet to come: once the trout are evacuated, the river will be completely drained.

By early 2026, the Spöl will be a dry trench, exposing the contaminated riverbed for heavy machinery. This is a "scorched earth" approach to cleaning—stripping the river down to its skeleton to remove the rot. Every kilogram of contaminated sludge excavated from the site will be transported across the country to Aargau for high-temperature incineration. The timeline is tight and the stakes are high, with the decontamination phase scheduled to conclude by the end of 2026. This is a massive, coordinated industrial effort within a delicate biosphere.

While the helicopters fly and the engineers dig, a storm brews over the balance sheet. Who pays for this multi-million franc intervention? That question remains dangerously unanswered. In a bold move that prioritizes nature over bureaucracy, project leaders have severed the cleanup operation from the ongoing financial liability disputes. "To speed up the work, we have decided to separate this project from the financial and liability issues," asserts Haller.

This decision is a gamble, but a necessary one. Waiting for legal clarity would mean leaving the ecosystem to rot. The Spöl cleanup joins a history of major human interventions in the park, echoing the controversies of the 1960s dam construction. However, the focus now is restoration, not exploitation. By pushing forward without a finalized check, Swiss authorities are making a powerful statement: the health of the National Park is priceless, and the cleanup cannot wait for the lawyers to finish their arguments.