Overview
- Bartłomiej Kubkowski is reported to have swum a continuous 160‑kilometre route from Kaseberga, Sweden, to Dziwnów, Poland while following no‑touch marathon‑swimming protocols and remaining in the water for roughly 55 hours.
- After finishing the swim he experienced severe sleep deprivation and hallucinations and was taken to a local hospital for three days of intensive monitoring for dehydration, muscle breakdown and exhaustion before being discharged in stable condition.
- Kubkowski and his support team say they followed marathon rules by passing food and liquids with long poles and avoiding physical contact with the boat, but public reports note limited documentation and no confirmed ratification by official swimming authorities.
- The crossing capped a multi‑year effort and was Kubkowski’s fifth attempt after earlier tries since 2021 and a near‑fatal 2025 rescue when he lost consciousness 11 kilometres from shore.
- The swim generated large donations for the Cancer Fighters Foundation with reported totals differing across accounts and the event has focused attention on the safety limits and verification processes for ultra‑endurance open‑water swims.