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![Proposed twin tunnel system [25]. | Download Scientific Diagram](/images/search?view=detailV2&id=3D59FBA4A8CBA6CE43EA6CE2AD731EC62B47FE8C&thid=OIP.ILrubahbQ2OVQIHb31cAQAHaCs&mediaurl=https%3a%2f%2fwww.researchgate.net%2fpublication%2f363436744%2ffigure%2ffig5%2fAS%3a11431281102359531%401669461365372%2fProposed-twin-tunnel-system-25.png&exph=310&expw=850&q=twin+tunnels+scenic+view&simid=608017050500596790&ck=95C4F146275280669C30407BBE7A09FB&itb=0&FORM=IVCLIG)
![Layout of Geometry of Twin Tunnels [6]. | Download Scientific Diagram](/images/search?view=detailV2&id=C54192CC083EE328C2081E304470B0E8DA76759E&thid=OIP.qp2p6LXGbVUVyVbDCemWvQHaDU&mediaurl=https%3a%2f%2fwww.researchgate.net%2fpublication%2f365484081%2ffigure%2ffig10%2fAS%3a11431281098534361%401668975521529%2fLayout-of-Geometry-of-Twin-Tunnels-6.png&exph=229&expw=511&q=twin+tunnels+construction&simid=608020726992478186&ck=11FA65024DA65257FCFD3F0DDB5C3BEF&itb=0&FORM=IVCLIG)
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