ice walls

Ability to exist a 200 meter high ice wall under physical view
The 200-meter-high ice wall, nearly 500 kilometers long, could repel the novel giant will soon collapse if built on Earth.
The wall is 20 meters across the largest freshwater lake in the Far East
A 20-meter-high ice wall and long kilometers appeared near the shore of Lake Khanka on the border area between Primorye, Russia and Heilongjiang Province, China, Earth Chronicles