Devon man becomes first person to swim Switzerland’s 10 largest lakes

Swiss Lakes, One Father, and a Fight for Recognition

Wanderstayfinder.com – Twelve-year-old Lily and ten-year-old Jack Gilson paddled through the cold water of Lac Léman, swimming the final 200 metres alongside their father as he crossed the finish line after more than 22 hours in the lake. Neil Gilson, 40, a former competitive swimmer from Devon, emerged from the water not with a triumphant leap but with a stagger — the cumulative toll of two summers spent conquering Switzerland’s ten largest lakes, a combined distance of roughly 230 miles (370 km).

“There were tears in my goggles. For the whole challenge, I was envisioning that moment. It kept me going through some difficult times – lovely.”

The swim that closed the campaign began Tuesday morning and ended Wednesday at lunchtime. Gilson had already logged a world record in 2024, crossing the same stretch of Lake Geneva in 22 hours and nine minutes. Yet that single feat felt incomplete to him. He set his sights on something far larger: completing every one of the country’s ten biggest inland waters, a sequence he and his backers have branded the “Legend of the Lakes” challenge.

From Pool Champion to Endurance Athlete

Gilson’s competitive résumé predates the lake project by years. Once ranked second in Britain for the 1500-metre freestyle, he transitioned from race swimming to ultra-endurance pursuits after leaving the pool circuit. Preparation for the Swiss campaign demanded relentless repetition: hours at a leisure-centre pool, open-water sessions along the north Devon coastline, and structured gym work to build the muscular endurance required for swims stretching beyond 40 miles.

The physical toll was not evenly distributed. This summer’s attempt on Lake Maggiore, a swim of approximately 40 miles, nearly broke him. The water ran colder than his models predicted, forcing him to increase stroke rate to maintain core temperature. That acceleration burned through his energy reserves faster than planned, leaving him with what he described as “nothing left” for the closing miles. Lake Thun presented a different kind of adversity: the psychological weight of completing the challenge, compounded by sheer physical exhaustion, caught up with him mid-swim.

“My arms don’t like me and I feel shattered.”

Gilson noted that lake swimming carried its own unpredictability absent from open-ocean swims. Wind-driven chop, sudden walls of colder water at depth, and shifting currents made conditions far less forgiving than the sea. Eighteen hours into the Léman crossing, during the darkest stretch of the night, he admitted he came close to quitting. The current ran strong, fatigue was total, and the only thing anchoring him to the effort was the knowledge that his family waited at the far shore.

A small support crew accompanied him by boat throughout each swim, providing coffee at intervals and, in his words, “the right things” — the verbal encouragement that kept morale from collapsing during the longest, coldest hours.

A Medical Mission Beneath the Swim

The lake campaign doubles as a sustained awareness campaign for a neuropsychiatric condition called PANDAS — Paediatric Autoimmune/Autoinflammatory Neurological Disorders Associated with Streptococcal infections — which struck Gilson’s son Jack at 18 months of age. The diagnosis followed a bout of tonsillitis. The onset was abrupt and terrifying.

“He went to bed a happy, healthy little boy, and woke up as someone we didn’t recognise, gripped by aggression, OCD [obsessive-compulsive disorder], tics and intense fear; he refused to eat, wouldn’t leave the house or even speak. It was terrifying.”

PANDAS and its broader cousin PANS (Pediatric Autoimmune Neuropsychiatric Syndrome) encompass a spectrum of symptoms spanning mental-health disturbances, behavioural changes, and motor difficulties. Gilson emphasises that the condition is neither rare nor invisible; rather, it is frequently missed by clinicians who encounter the symptoms for the first time. Every kilometre he swam, every difficult night in open water, was framed by that advocacy purpose.

“The challenge has always been about more than swimming. Every lake, every kilometre and every difficult moment has been about raising awareness of Pans and Pandas. It’s a condition that isn’t rare but is rarely diagnosed. Raising awareness of it means more than anything.”

Jack, now ten, is doing well — a fact made vivid by his willingness to enter the lake and swim the final stretch beside his father. His recovery underscores both the treatability of the condition when identified and the importance of early diagnosis.

Records, Recognition, and What Comes Next

Gilson narrowly missed beating his own 2024 Léman record on the closing swim, finishing just over 22 hours rather than under the previous benchmark. He nonetheless expects Guinness World Records to formally recognise him as the first individual to complete all ten Swiss lakes in sequence. He anticipates that the achievement will open the door for other ultra-swimmers to attempt the route in future seasons, potentially shaving hours off the total time.

For Gilson, the significance of the campaign extends well beyond any single stopwatch reading. It is a two-year physical odyssey, a family story told in cold water and exhausted limbs, and a public-health message aimed at parents and paediatricians who may encounter a child whose personality shifts overnight after a common infection. The lakes of Switzerland, he has demonstrated, can carry that message across 230 miles of open water.