Stream The Great Wall of Japan Online Free – Watch Full Movie from Home at 123Movies. . After the disaster of March 2011, the Japanese authorities decided to build a gigantic 15 meter high, 500 kilometer long, anti-tsunami wall, separating the land and the ocean. But what is the environmental and human impact of this wall? The population is divided on their opinion: should they cut the island off from the sea or stay vulnerable to tsunamis? Is there another way?