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![Another form of spiral tunnels [9] | Download Scientific Diagram](/images/search?view=detailV2&id=89F6961A1B4AF133B88407D7CE91C0CEAB0EAEE4&thid=OIP.q2kQlBl8mbIu3Dj-EIrG_AHaFj&mediaurl=https%3a%2f%2fwww.researchgate.net%2fprofile%2fEric-Fimbinger%2fpublication%2f349070404%2ffigure%2ffig11%2fAS%3a991398283182081%401613379178337%2fAnother-form-of-spiral-tunnels-9.jpg&exph=484&expw=646&q=spiral+tunnels+history&simid=608013485739020623&ck=B0902DE69714B37E9FB9475DB6C068E9&itb=0&FORM=IVCLIG)
![Spiralling tunnels on the Gothard Line, Switzerland [1536x1125] : r/MapPorn](/images/search?view=detailV2&id=ACCFE6D3E2524261F4613E5619CA8E35F5380615&thid=OIP.5S1_rZXE-51J7ciIkKfZPAHaFb&mediaurl=https%3a%2f%2fi.redd.it%2fqi7227r4ok2y.jpg&exph=1125&expw=1536&q=spiral+tunnels+history&simid=607993119034928657&ck=57684016D3D776E23C1F4D2B28D7D986&itb=0&FORM=IVCLIG)
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