By day Ms Schelb is a teacher in her home country of Switzerland but her hobby is dangerous rock-climbing

Rahel said: 'For single pitch routes we normally had between 30 and 60 minutes. If the crack led all the way up until the top, it was a day project.

'That means that we started at the bottom of the wall in the morning and reached the top at some point in the afternoon. And of course to get back to the ground would take us a few hours too.'

Over 25 days she climbed around 60 routes, ranging from crevices 20 to 30 metres high to cracks that stretched all the way from the bottom to the top of the rock face