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Tunnelling shield
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==Shields in Japan== [[File:Shielded-machine.JPG|thumb|Tunnel boring machine to excavate a Double-O-Tube]] [[File:Double-O tube Tunnel.jpg|thumb|Double-O tube tunnel example]] 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.<ref>{{cite web|title=Special Shield Tunnels|url=http://www.nccnet.co.jp/english/introduction/specialshieldtunnels.html|publisher=Nippon Civic Consulting Engineers Co., Ltd.|access-date=2011-07-24|archive-date=2011-07-22|archive-url=https://web.archive.org/web/20110722094353/http://www.nccnet.co.jp/english/introduction/specialshieldtunnels.html|url-status=live}}</ref>
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