An Irish ultra runner - who is the only man on the planet to run seven marathons in less than seven days on seven continents - is expected to break his own record today.
Richard Donovan is on course to complete his final run in aid of charirty in Sydney and smash the five-day barrier.
The 45-year-old began his epic quest in the extremes of Antarctica.
His current record stands at five days, 10 hours and eight minutes. His aim is to knock half a day off that record.