Yuko Matsuzaki of Tokyo, the only Japanese Honor Swimmer in the International Marathon Swimming Hall of Fame, completed a Guinness World Record for the Longest continuous swim in a counter-current pool at Seaside Lagoon in Redondo Beach, California, U.S.A. from 8:00 am on Saturday, 5 October 2019 to 8:01 am on Sunday, 6 October 2019 under the observation of Shelley Taylor-Smith, Steven Munatones, and Chris Morgan of the World Open Water Swimming Association. Additional observers throughout the 24 hours included Chieko Smith, Josef Köberl, and Mark Lutz and the Endless Pool staff.
