will drastically redraw the road and rail maps of Europe. The Fehmarnbelt tunnel may not have grabbed the popular imagination in the same way as the Channel Tunnel between Britain and France did ...

Finally, the team made use of ground-penetrating radar to more accurately map out the tunnel system ... hinted at the presence of an underground network of tunnels built by the Inca, yet until ...

U.S. and South Korean troops honed their underground combat skills using drones and breaching tools as part of a recent large ...