Here is video of the descent from La Berarde to St. Christophe, deep in the Ecrin National Park. The tiny village of La Berearde is situated at the back of a very steep glacier-carved canyon, and is surrounded by high mountains.

http://youtu.be/Xm0QCbvjghI

This is the first of what was a three-part descent, and it was stunning! To give you a sense, here's a photo of the village (from the restaurant where we ate fabulous crepes) and surrounding mountains. (Photos just don't do it justice):