Schematic diagram of the test site The upper half of the following image shows where the test was conducted on Oct. 9(on the lower left corner of the map marked with orange flash symbol), and another new site for additional test(on the upper left corner, marked with a small yellow dot) The lower half of the image show the schematic diagram of the test site, with horizontal tunnels looping downward at the end to reach the test chamber. The illustration says that the tunnel is suspected to be from several hundreds meter to one kilometer long.