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The city of Zug is built in part on the unconsolidated sands of an old delta. The shoreline along this old delta was being extended and a retaining wall was built. On July 5, 1887, at 15:35, two houses and a section of sea wall sank suddenly into the lake. At 18:55, an area extending 150 m along the shore and 80 m inland had sunk 78 m, destroying more houses.