Archaeologists in Peru have confirmed the existence of a mile-long underground tunnel network ... The newly verified tunnel system connects the city's Temple of the Sun to the ancient Sacsayhuaman ...

After centuries of speculation, archaeologists in Peru have confirmed the existence of an underground ... civilisation as the tunnels likely served as a communication system across the city.

The U.S. Drug and Enforcement Agency could hire informants to reveal where Mexican drug cartel tunnel "cover-ups" are located ...