
It was a long time coming, but Mark Sowerby (MSF bio here) finally achieved the Oceans Seven today with a 10 hour 6 minute crossing of the Tsugaru Channel between Honshu and Hokkaido in northern Japan.
From his farm in the Gold Coast of Australia, the 52-year-old Sowerby has traveled the world over the last decade to become the 29th person in history to completed the Oceans Seven.
- English Channel, August 2015 in 14 hours 24 minutes
- Molokai Channel, April 2022 in 14 hours 23 minutes
- Catalina Channel, October 2022 in 10 hours 43 minutes
- Strait of Gibraltar, April 2023 in 3 hours 24 minutes
- North Channel, September 2023 in 12 hours 12 minutes
- Cook Strait, February 2024 in 8 hours 3 minutes
- Tsugaru Channel, June 2024 in 10 hours 6 minutes
After his 9-year journey to complete the Oceans Seven was over, Sowerby returned home and used his well-developed waterman’s expertise and sense of calm to save him from a freak injury in the ocean.
Listen above to this interview with Oceans Seven creator Steven Munatones.



Oceans Seven Swimmers in History:
- Stephen Redmond (Ireland)
- Anna Carin Nordin (Sweden)
- Michelle Macy (USA)
- Darren Miller (USA)
- Adam Walker (UK)
- Kimberley Chambers (New Zealand)
- Antonio Argüelles (Mexico)
- Ion Lazarenco Tiron (Moldavia and Ireland)
- Rohan Dattatrey More (India)
- Abhejali Bernardová (Czech Republic)
- Cameron Bellamy (South Africa)
- Lynton Mortensen (Australia)
- Thomas Pembroke (Australia)
- Nora Toledano Cadena (Mexico)
- Mariel Hawley Dávila (Mexico)
- André Wiersig (Germany)
- Elizabeth Fry (USA)
- Attila Mányoki (Hungary)
- Jonathan Ratcliffe (UK)
- Jorge Crivilles Villanueva (Spain)
- Adrian Sarchet (Guernsey)
- Prabhat Koli (India)
- Dina Levačić (Croatia)
- Herman van der Westhuizen (South Africa)
- Andy Donaldson (Scotland)
- Stephen Junk (Australia)
- Kieron Palframan (South Africa)
- Bárbara Hernández Huerta (Chile)
- Mark Sowerby (Australia)
- Paul Georgescu (Romania)
- Zach Margolis (USA)
- Petar Stoychev (Bulgaria)
- Nathalia Pohl (Germany)
- Caitlin O’Reilly (New Zealand at the age of 20 years 7 months 15 days)
- Ryan Utsumi (USA)
- Marcia Cleveland (USA)
- Eduardo Collazos Valle-Guayo (Peru)
© 2024 Daily News of Open Water Swimming
“to educate, enthuse, and entertain all those who venture beyond the shoreline“
A World Open Water Swimming Federation project.
Mark, Remarkable journey, congratulations.