Polar explorer and ex-Navy Seal; Rune Gjeldnes is the only person in the world who has crossed both the North Pole and the South Pole, unsupported on ski. 2006 he crossed Antarctica alone and without re-supplies. It was the longest skitrip ever, counting 4804 km in 90 days.
In 2000, together with Torry Larsen, he became the first and only to cross the Arctic Ocean, from Siberia via the North Pole to Canada, without re-supplies. The trip lasted a full 109 days. In 1996, together with Torry Larsen, he became the first ever to cross Greenland lengthways, from Southern tip to the Northern tip without re-supplies.
This makes him the first person ever to have crossed both Poles without re-supplies, and also the three biggest ice areas on Earth.