Meet Stephanie Case - the first woman to run 100 miles in Antarctica

The human rights lawyer crossed the line 29 minutes after Chinese runner Yusheng Ni, who smashed his own world record - set last year - by over five and a half hours.

Alongside making history, Case had also been chasing the world record but knew she would have a "formidable challenge" on her hands with Ni, who has completed more than 500 ultramarathons, in the pack.

"There were parts where I was 60 seconds behind him or I was sometimes just 200 metres behind him. It was a real race. But whenever he saw me getting close, he would look behind and he would just take off. I think we really pushed each other to get our best performances.