A Former International Swimmer Completes Switzerland's Ten Largest Lakes — and Puts a Rare Childhood Condition on the Map
Neil Gilson, a 40-year-old former international swimmer from Devon, England, has become the first person to swim the ten largest lakes in Switzerland. He completed the roughly 230-mile (370km) challenge with an approximately 45-mile crossing of Lac Léman (Lake Geneva) that took just over 22 hours, entering the water on Tuesday morning and finishing on Wednesday lunchtime, according to The Guardian. His 12-year-old daughter Lily and 10-year-old son Jack swam the final 200 metres alongside him as he reached the shore.
Gilson titled the project the "Legend of the Lakes" challenge on his personal website. It spanned two summers and covered ten lakes: Lugano, Constance, Neuchâtel, Biel, Maggiore, Zug, Lucerne, Zurich, Thun, and Léman. The undertaking demanded not only endurance across vast freshwater distances but adaptation to sharply varying conditions. A roughly 40-mile swim in Lake Maggiore nearly ended the project when the water proved colder than anticipated, forcing Gilson to swim faster and expend more energy than planned. Lake Thun, though shorter, was surprisingly difficult because the accumulated physical toll and the pressure to complete the series caught up with him simultaneously.
His athletic background provided the foundation. Gilson was once ranked second in Britain for the 1500-metre freestyle, a credential that informed his capacity for sustained, high-intensity pacing over marathon distances. In 2024 he swam across Lac Léman in 22 hours and nine minutes, setting a world record for that crossing. The final swim of the ten-lake series, completed within a planned window of 24–29 August per his Facebook page, took just over 22 hours and concluded the challenge.
The crossing was not a solitary effort. A support team accompanied Gilson in a boat, providing coffee and encouragement throughout. Eighteen hours into the Lac Léman swim, strong currents at night nearly forced him to abandon the attempt. He continued because his family was waiting for him at the finish.
The motivation behind the challenge extends beyond athletic achievement. Gilson is using the swims to raise awareness of PANDAS (Paediatric Autoimmune Neuropsychiatric Disorders Associated with Streptococcal Infections), a rare condition in which the immune system mistakenly attacks the brain following common infections such as strep throat or tonsillitis, according to his website. His son Jack was diagnosed with PANDAS after catching tonsillitis at around 18 months old, subsequently developing aggression, obsessive-compulsive behaviours, tics, intense fear, and regression following repeated infections.
The family spent years visiting doctors without a diagnosis before finding a physician who recognised the condition after learning of another family's PANDAS story. Within weeks of beginning treatment, Jack's symptoms improved dramatically; he is now symptom-free and thriving at school and in sports, his website states.
The diagnostic landscape for PANDAS in the UK remains thin. PANS PANDAS UK, the only charity in the country for children and young people living with post-infectious neuropsychiatric disorders, provides support, information, and advice to affected families. With no widely adopted clinical guidelines across the NHS, the charity functions as the primary avenue of trusted guidance for the PANS/PANDAS community, according to both the charity's site and Gilson's.
The broader context here matters. Conditions like PANDAS occupy an awkward space in clinical practice: the immune-mediated neuropsychiatric mechanism — the idea that the body's infection-fighting defences can mistakenly target brain tissue — is increasingly studied in research settings, yet standardised diagnostic pathways within national health systems remain underdeveloped. Families navigating repeated infections that trigger acute behavioural changes frequently encounter a gap between emerging evidence and routine clinical recognition. By attaching his name to a record-setting athletic feat, Gilson is attempting to direct public attention toward that gap and toward the possibility that earlier identification and treatment can produce dramatic recovery, as it did for his son.
The ten-lake series also sits within a broader tradition of marathon swims that double as advocacy platforms. What distinguishes Gilson's project is its cumulative scope: rather than a single headline crossing, the challenge required sustained commitment across multiple environments, water temperatures, and distances over two seasons. The Lac Léman finale, with his children joining him for the last stretch, was designed to make the personal stakes of the cause visible in the most direct way possible.
Gilson has said he is determined to share his family's story in the hope of helping other families find a diagnosis for their children. Whether the visibility generated by the swim translates into measurable policy or clinical change is an open question, but the challenge has now placed PANDAS before an audience that might otherwise never have encountered the term.
