abandoned main street was swallowed by a massive 17-hectare landslide. On November 30, 1977, the Tuve landslide in western Sweden killed 9 people and destroyed 67 houses. Another famous flow of quick clay at Rissa, Norway, in 1978 caused about 33 hectares (82 acres) of farmland to liquefy and flow into the lake Botn over a few hours, with the loss of one life. The Rissa slide was well recorded by local citizens and a documentary film was made about it in 1981. On 11 May 2010, quick clay took the lives of a family living in Saint-Jude, Quebec, when the land their house was built on suddenly tumbled down toward the Salvail River. The landslide was so sudden that the family members died where they sat; they had been watching an ice hockey game on television. The slide took out a portion of rural road which took a year to reinstate. On 2 February 2015, a landslide collapsed a pillar on the Skjeggestad Bridge in South-East Norway. The landslide was caused by nearby earthworks. On 3 June 2020, eight buildings were swept into the sea by a landslide in Kråkneset in the Alta municipality in Norway. The landslide was filmed by a resident. There were no casualties, and a dog was rescued from the sea. On 30 December 2020, part of a housing area was swept away by a landslide in Ask in the Gjerdrum municipality in Norway, 25 km (15 miles) north-east of the capital Oslo. A 300 m × 700 m (985 ft × 2300 ft) quick clay landslide occurred wrecking many houses and killing eight adults and two children. The instability of the ground and poor weather still hamper the search for survivors. More than 1000 persons are also being evacuated from the village. These landslides are retrogressive, meaning they usually start at water, and progress upwards at slow walking speed, although particularly deep quick clay layers on sloped regions may collapse much more rapidly, or in very large chunks that can slide at great speed due to the liquid nature of the disturbed clay. They have been known to penetrate kilometers inland, and consume everything in their path. In modern times, areas known to have quick clay deposits are commonly tested in advance of any major human development. It is not always possible to entirely avoid building on a quick clay site, although modern engineering