The ascent usually takes 2 days. From Saint-Gervais-les-Bains, climbers must first reach the Nid d'Aigle, either via the Mont Blanc Tramway or by foot. From here, climbers hike to and then ascend a lateral moraine to the Tête Rousse Hut and the Tête Rousse Glacier. After crossing the Tête Rousse glacier, climbers access a short stretch of rock and immediately afterwards reach the infamous Couloir du Goûter or Grand Couloir. The 100 m-long section, which takes about 30 seconds to cross, is protected by a steel cable, intended to be used in avalanche emergencies only.