The short version
- Neil Gilson became the first person to swim across all ten largest lakes in Switzerland, covering approximately 230 miles over two summers.
- The former international athlete faced significant physical challenges, including unpredictable weather and cold water currents, during the multi-year project.
- Gilson undertook the feat to raise awareness for PANDAS, a neuropsychiatric disorder that severely affected his young son following a childhood illness.
Neil Gilson has become the first individual to complete swims across the ten largest lakes in Switzerland, finishing a demanding endurance project that spanned two summers and covered roughly 230 miles. The Devon-based father of three concluded his journey on Wednesday with a crossing of Lac Léman, also known as Lake Geneva. This final leg required just over 22 hours to complete, marking the end of a rigorous physical undertaking that tested his limits repeatedly throughout the process.
Gilson, who previously competed at an international level in the 1500-meter freestyle and once ranked second in Britain for the event, transitioned from competitive racing to ultra-endurance challenges after his athletic career. He had already established a world record for crossing Lac Léman in 2024, completing that specific swim in 22 hours and nine minutes. However, he determined that this single achievement was insufficient for his goals, prompting him to design a broader challenge involving the country's major bodies of water.
The preparation for these swims involved extensive training at a local leisure center pool, open-water sessions off the north Devon coast, and dedicated gym work. Despite this rigorous regimen, Gilson encountered significant difficulties during the campaign. A swim in Lake Maggiore proved particularly arduous due to unexpectedly cold temperatures. The chill forced him to increase his pace to maintain core body heat, which depleted his energy reserves faster than anticipated and left him physically exhausted for the final miles of that segment.
Lake Thun also presented unexpected hurdles, with Gilson reporting that the cumulative pressure of the challenge combined with physical exertion took a heavy toll. He described feeling shattered after exiting the water, noting that his arms were severely fatigued. He observed that swimming in lakes is generally more demanding than ocean swims due to unpredictable conditions. Wind can create choppy surfaces, and swimmers may encounter sudden walls of cold water that disrupt their rhythm and energy conservation strategies.
The final crossing of Lac Léman began on Tuesday morning and concluded on Wednesday afternoon. During the night hours, Gilson faced strong currents and considered abandoning the attempt around the 18-hour mark. He credited his support team, who accompanied him by boat, for providing essential encouragement and coffee. The presence of his family at the finish line served as a critical motivator during these difficult moments.
As Gilson approached the end of the Lac Léman swim, his children joined him in the water for the final 200 meters. His daughter Lily and son Jack accompanied him across the finishing line, an emotional moment that Gilson had visualized throughout the entire challenge. He described the experience as keeping him going through tough periods, noting that tears filled his goggles during this concluding phase.
While Gilson narrowly missed breaking his own world record for the Lac Léman crossing, he expects Guinness World Records to recognize him as the first person to complete what has been termed the Legend of the Lakes challenge. He anticipates that other ultra-swimmers may attempt to replicate or improve upon this feat in future years. The accomplishment stands as a significant milestone in open-water swimming history.
Beyond the athletic achievement, Gilson’s primary motivation for undertaking this challenge was to raise awareness for PANDAS, a neuropsychiatric condition that affected his son Jack at 18 months old. After contracting tonsillitis, Jack experienced sudden and severe behavioral changes, including aggression, obsessive-compulsive disorder symptoms, tics, and intense fear. He refused to eat or speak and would not leave the house, creating a terrifying situation for the family.
Jack has since recovered significantly, as evidenced by his participation in the final swim with his father. Gilson emphasized that the challenge was always about more than just swimming; each lake and kilometer was dedicated to highlighting PANS and PANDAS. These conditions are not rare but are frequently underdiagnosed. Gilson stated that increasing public understanding of these disorders is the most important outcome of his efforts.
Sources behind this briefing
Go to the original reporting
- The Guardian World↗Devon man becomes first person to swim Switzerland’s 10 largest lakes
