Shields in Japan
In Japan there are several innovative approaches to shield tunnelling, e.g. the Double-O-Tube or DOT-tunnel. This tunnel looks like two overlapping circles. There are also shields with computerized arms which can be used to dig a tunnel in virtually any shape.
Read more about this topic: Tunnelling Shield
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—Sir William Rootes (1894–1964)
“I do not know that the United States can save civilization but at least by our example we can make people think and give them the opportunity of saving themselves. The trouble is that the people of Germany, Italy and Japan are not given the privilege of thinking.”
—Franklin D. Roosevelt (1882–1945)