Analysing terrain data
The exposure grade does not take into account objective hazards (stone fall, seracs, etc) but only the consequences of the skier falling.
Low Exposure (E1): Exposure is limited to that of the slope itself. Getting hurt is still likely if the slope is steep and/or the snow is hard.
Medium Exposure (E2): As well as the slope itself, there are some obstacles (such as rock outcrops) which could aggravate injury.
High Exposure (E3): In case of a fall, death is highly likely.
Extreme Exposure (E4): In case of a fall, the skier faces certain death.
From top of Marmotte III go on the Cristaux slope and do a long traverse to the right (you have to stay quite high up.) You will always find tracks here as the route is very popular and it's accessible to all levels of skiers provided you're competent off-piste.
The skiing follows a pleasant combe and then rejoins the Sarenne piste.
From the Sarenne slope you can reach Alpe d'Huez with the Chalvet lift or the Alp'Auris.