The U24 isn’t your average ocean swim. It’s an ultra-marathon challenge made for endurance junkies, relay legends, and anyone ready to test the outer edges of their open water limits.

Set in the calm, expansive waters of Port Phillip Bay, the U24 offers 12km and 24km solo options for those with serious stamina, along with a 4-person relay format that blends big distance with team spirit. The course, looped from the iconic Sorrento Beach, features flat, bay-friendly conditions that make it more about mindset and pace than surf and chaos.

But don’t be fooled, it’s still a beast. Clocking up the Ks requires careful planning, consistent fuelling, and mental grit to stay focused and strong lap after lap. Whether you’re swimming solo or as part of a tag-team crew, you’ll feel the burn and the buzz.

This is a swimmer’s swim: no distractions, just you, the water, and the distance. With beach support crews, a vibe that grows as the laps tick by, and a finish line that hits differently after hours in the water, the U24 is one of the most rewarding swims on the calendar.

And when it’s all done? There’s nothing better than flopping onto the sand with your relay mates (or solo glory), knowing you’ve just taken on something extraordinary.