The exhausting ultra-trail from Mont-Blanc: the filmmakers capture one of the hardest ultramarathons

Each summer, viewers of the Tour de France marvel at its acrobatic cameramans, balanced on the back of motorcycles deducing mountain passes. They would be just as impressed if they saw the operators of cameras at work during the ultra-trail of Mont-Blanc. France2 Denis Sébastien and Nicolas Baker, with France24 Peter O’Brien Report.