I added this to my list of recommended walks in the area, as I’d seen it in a guide book and I’m glad I did.  Although it’s only possible to reach the Cabane de Bertol (@3311m) by crossing the glacier (with the aid of crampons and a guide), I made it to the Glacier de Bertol sign just below (see Selfie picture – where, completely by chance, the sign pointed exactly at the Cabane !)  As ever, the views were amazing.