On the afternoon of January 7 this year, the surface of the lake collapsed in Rainbow Lake Park, and the park began to be closed for renovation. On the 4th, the park has been temporarily reopened. Some of the construction areas still have not been demolished. The water level of Rainbow Lake is the same as that of the same period of the previous year. Trees, cruise ships and lake waves complement each other, and the autumn scenery is particularly pleasant. Geological exploration personnel drilled wells in various areas of the park to carry out underground “finding the bottom”. Initial exploration revealed that a large amount of groundwater began to appear in the underground 80 meters, and the accumulated water layer reached about 300 meters underground.