Simon Wheatcroft is completely blind. But that's not going to stop him running a 250 kilometer (155.3 mile) race in the desert.
The British runner started off the feat on Monday. It consists of a number of long distance runs happening over six days in a desert in Namibia.
"I decided I wanted to run, I decided myself one day thinking I really wanted to go out there and push the boundaries of what was possible," Wheatcroft told CNBC in an interview.
To help him compete in the "ultra-marathon", Wheatcroft partnered with IBM to build an app that would be able to help him navigate situations.
The app is called eAscot – after the name of Wheatcroft's guide dog – and uses coordinates to plot a route. Wheatcroft recently ran the Boston Marathon for which IBM programmed the route. When Simon veered too far left or right from the straight path, the smartphone app would making a beeping noise in his headphones, and alert him to get back on track.
"(It's) Like a cross between satellite navigation and the reversing sensors in your car. So if Simon is too far left from where he is going it beeps and if he is too far right it beeps with a different pitch," Holly Cummins, technical lead at IBM's Bluemix Garage, told CNBC in an interview.