Sportshour

River...Martin Strel is a swimming marvel. The Slovenian holds multiple world records, and his specialty is swimming the entire length of rivers... Amazon, Thames, Mississippi, Yangtze, Danube, you name it, he's swam it. Except the Nile! So why not?! Martin tells us about his amazing feats of swimming and why the Nile is not on his list of river results.Deep...In 2000, Jill Heinerth was already a renowned diver, known for her exploits mapping vast underground cave networks in Florida. Filming for a National Geographic documentary brought a new and unprecedented challenge; a vast iceberg known as B-15 had broken away from an ice shelf in Antarctica, providing a unique chance to explore its networks of underground caves. Braving sub zero temperatures and the treachery of constantly shifting ice, Jill became the first person to ever enter one of these caves - a historic milestone in diving.Mountain... Joshua Patterson is an ultra-marathon runner who later this month will attempt to become the first man to comp