Hidden underground tunnel system built by Incas found beneath Cusco
Under Inca rule, Cusco was developed into a complex urban centre with distinct religious and administrative functions. It is ...
Daily Express16d
The new £3.1bn underwater tunnel that will be world's longest and connect continents
The Great Istanbul Tunnel ... rail system running from west to east across Istanbul, the minister said. The Great Istanbul Tunnel project is being excavated using one of the world's largest ...
BBC6y
Shieldhall Tunnel now operational as Scotland's biggest sewer
It is the biggest waste water tunnel ... system which will improve the environment and biodiversity on the River Clyde and help tackle flooding. "As the Greater Glasgow area continues to develop ...