From Openwaterpediamarathon swimmer from Argentina who was inducted in the International Marathon Swimming Hall of Fame in 1964 as an Honour Swimmer. He is a member of the 24-hour club.
From 1942 to 1961, Abertondo swam many marathon swims in Argentina. In 1946, he successfully crossed Rio de la Plata in 29+ hours. His five English Channel crossings were in the 1950 and 1951 Daily Mail races, the 1954 Billy Butlin race and in 1961 when he became the first person to do a double-crossing of the English Channel in 43 hours 10 minutes (with a four-minute onshore rest).