Rockfalls
On the morning of October 30, 2006, a mass of 1,000,000 m³ (35,300,000 ft³) of rocks detached themselves from the side of the Haute Cime and fell down the side to an altitude of about 3,000 m (9,800 ft) The event did not pose any danger for the nearby town of Val-d'Illiez but roads and footpaths were closed as a security measure. According to the geologists of the canton, the landslide was caused by thawing, assisted by the hot summers of the preceding years.
Shortly after midday on Friday 17th August 2012, another significant rockfall occurred below the Cathédrale, amounting to at least 100,000m³ of rock. Twelve hikers were rescued by helicopter, All were unscathed, as was a flock of sheep grazing nearby. Again, the fall was put down to exceptional heat locally.
Less serious falls continued over the next few days and hiking trails remained closed.
Read more about this topic: Dents Du Midi