(CNN) — Johanna Davidsson doesn't remember saying goodbye to the pilot who left her alone on a frozen wasteland. Looking back, her strongest memory is a thought that rose up as she watched the plane disappear out of sight. A thought that said, "Oh my God, what have I done?"
The year was 2016 and the Swedish nurse was fulfilling a dream a decade in the making: to ski solo to the geographic South Pole. Starting at Hercules Inlet in West Antarctica, ahead lay 1,130 kilometers (702 miles) of barren nothingness that Davidsson would have to navigate unsupported and unaided, with a 110-kilogram (243-pound) sled in tow.
