UltraSwim 33.3 #7Croatia, 16-19 May 2025 | World's Marathons

ultra33The Ultra33 combined with the Quantum Fireball ST is an unbeatable team, and approaches SCSI performance closer than any other hard drive. It is definitely worth the extraUltraSwim 33.3 offers you the opportunity to complete the iconic 33.3km distance of the English Channel, spread over 5-7 swims, over a 4-day long weekend in stunning locations around the world.