If you'd like to take part in an UltraSwim 33.3 we'll support you in finding the right event and format for you.
We know that committing to these types of events needs planning around work, family time and health. The information you share about your journey helps us get you to your goal.
Ten short questions, about one minute to complete. Tell us where you are with your swimming and which destination has your attention, and the team will come back to you.
Thank you. One of the team will read your answers and come back to you personally. In the meantime, have a look at where you could be swimming.
See the 2026 and 2027 eventsUltraSwim 33.3 was born from a simple idea: the English Channel distance is one of the most iconic numbers in sport, but is a notoriously difficult to organise and plan challenge - and not an easy piece of ocean to cross.
Mark Turner founded the event in 2018 and ran the first pilot in Montenegro with just 20 swimmers - the idea being to take on the same distance, but spread over 4 days, in warmer and more hospitable waters, staying in luxury hotels and backed by a team that treats you like a pro. It has since grown into seven events across Europe and the Caribbean, with a community of more than 1000 Finishers.
Nic Cranfield, who completed the Greece edition in 2024, described the moment she stepped onto the dock as one of the most significant of her life. She had trained for seven months, swum alone for long stretches, and arrived at each stage start not entirely certain she could finish. She always did.
Over 500 finishers across all editions. Median age 50, this is not just for the young. 60% of finishers come back for a second event. Most swimmers arrive alone and leave with close friends.
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All our events so far have won awards. See reviews from other swimmers.
UltraSwim 33.3 brings together triathletes, recreational swimmers, open water veterans and complete newbies to open water swimming. Your age, your background and your pace do not matter. What matters is your willingness to show up and give everything you have over four extraordinary days.
Swimmers aged 14 to 76 from more than 40 countries, with a median age of 50+. Slightly more women than men, one of the most inclusive communities in endurance sport. Most swimmers arrive alone and leave with friendships that last long after the finish line.
We have a fantastic team of experts to help you along your UltraSwim 33.3 journey, from our affiliate coaches to physios and nutritionists, we can support you with whatever you may need.
Explore the format, structure and key elements of the UltraSwim 33.3 experience, helping you understand what to expect and how the event comes together.
This video brings the format, structure and key elements of the experience to life, showing how each stage comes together to create the unique UltraSwim 33.3 challenge. Designed to give you a feel for the event and how it unfolds, the video focuses on the experience itself - from the format and flow through to the practical details of taking part. While the video shows the practical side of how an UltraSwim 33.3 works, for a deeper feel of the atmosphere, emotion and personal stories that make UltraSwim 33.3 so special, explore our other videos.
Ten short questions, about two minutes. Tell us where you are with your swimming and which destination has your attention, and the team will come back to you.
Thank you. One of the team will read your answers and come back to you personally. In the meantime, have a look at where you could be swimming.
See the 2026 and 2027 events