![La Cuevona in Cuevas del Agua Asturias, Spain: a natural cave used as a transportation tunnel. : r/Damnthatsinteresting La Cuevona in Cuevas del Agua Asturias, Spain: a natural cave used as a transportation tunnel. : r/Damnthatsinteresting](https://external-preview.redd.it/la-cuevona-in-cuevas-del-agua-asturias-spain-a-natural-cave-v0-c3BldzhnOGN5ampiMSqyL_tCUqCrD-b80pUQcKM-XkS63MS-QdYZ_S4g0dKj.png?format=pjpg&auto=webp&s=188532160cabcdebce384762b7e65fc140ba79ea)
La Cuevona in Cuevas del Agua Asturias, Spain: a natural cave used as a transportation tunnel. : r/Damnthatsinteresting
![Workers complete primary excavation of downtown Seattle transit tunnel on April 8, 1988. - HistoryLink.org Workers complete primary excavation of downtown Seattle transit tunnel on April 8, 1988. - HistoryLink.org](https://www.historylink.org/Content/Media/Photos/Large/two-men-walking-in-bus-tunnel-january-19-1988.jpg)
Workers complete primary excavation of downtown Seattle transit tunnel on April 8, 1988. - HistoryLink.org
![Tunnel Vision: Rachel "Bores" the Clearwater Project to Preserve Local Waterways - South Bay Cities Council of Governments Tunnel Vision: Rachel "Bores" the Clearwater Project to Preserve Local Waterways - South Bay Cities Council of Governments](https://southbaycities.org/wp-content/uploads/2022/05/LACOSD-Clearwater_TBM-shaft-6-enhanced-2-scaled.jpg)
Tunnel Vision: Rachel "Bores" the Clearwater Project to Preserve Local Waterways - South Bay Cities Council of Governments
![Hon'ble Chief Minister of Arunachal Pradesh Shri Pema Khandu was present during the inauguration of 500-metre-long Nechiphu Tunnel | IBG News Editor Desk Hon'ble Chief Minister of Arunachal Pradesh Shri Pema Khandu was present during the inauguration of 500-metre-long Nechiphu Tunnel | IBG News Editor Desk](https://ibgnews.com/wp-content/uploads/2023/09/6823201a-7871-44b7-b3ce-f1d0f8b802de.jpg)
Hon'ble Chief Minister of Arunachal Pradesh Shri Pema Khandu was present during the inauguration of 500-metre-long Nechiphu Tunnel | IBG News Editor Desk
![Stiver Engineering Projects | 108-inch Waterline EPBM Tunnel Project Beneath US59 - Smith to Lee Segment Stiver Engineering Projects | 108-inch Waterline EPBM Tunnel Project Beneath US59 - Smith to Lee Segment](https://stiverengineering.com/wp-content/uploads/2021/04/IMG_3707.jpg)
Stiver Engineering Projects | 108-inch Waterline EPBM Tunnel Project Beneath US59 - Smith to Lee Segment
![Tunnel Vision: Rachel "Bores" the Clearwater Project to Preserve Local Waterways - South Bay Cities Council of Governments Tunnel Vision: Rachel "Bores" the Clearwater Project to Preserve Local Waterways - South Bay Cities Council of Governments](https://southbaycities.org/wp-content/uploads/2022/05/Pg-5_-LACOSD-Russ4-2-scaled.jpg)
Tunnel Vision: Rachel "Bores" the Clearwater Project to Preserve Local Waterways - South Bay Cities Council of Governments
![Technical Light at the end of the tunnel: a new rail link to Barcelona airport constructed under a runway - UITP Summit Technical Light at the end of the tunnel: a new rail link to Barcelona airport constructed under a runway - UITP Summit](https://uitpsummit.org/wp/wp-content/uploads/R-Aeroport.png)