We all know what hydrospeed is. But do you know what is glacial hydrospeed ? I’m sure you can imagine it. To illustrate it, take a look to these stunning pictures. Claude Alain Gailland and Gilles Janin rode the longest glacier located in Aletsch, Switzerland. David Carlier who is a extreme sports photographer shot this amazing performance for us. The pictures have all we love, extreme sports and landscape.