Martin Strel, a 66-year-old Slovenian known as the "The Fish Man" and "Big River Man," finished a 66 days swim down the Amazon River in 2007, setting the world record for the longest swim. He became the first man to swim the entire length of the famous river from headwaters in Peru to the Brazilian port city of Belém, for a total of 3,274 miles, swimming for more than 10 hours every day, according to Amazon Swim. A decade earlier, Martin Strel became the first man to swim non-stop from Africa to Europe. It took him 29 hours, 36 minutes, and 57 seconds to complete the task. And he did it without a wetsuit, under supervisions and seven international judges. Seven swimmers had tried the same trip before him, but none of them succeeded.