3
Scientists have found evidence of a subterranean labyrinth of tunnels hidden beneath the planet's surface.
4
Saturn's moon Titan may be home to habitable subterranean pockets of liquid water.
12
The ruins of an ancient city in southern Mexico have yielded evidence of long-lost underground tunnels.
3
East London's Blackwall Tunnel, which stretches underneath the Thames, remains a hotspot for ghostly tales.
79
A group of anonymous individuals have been digging tunnels in search of evidence of 'giants' in New Zealand.
3
Many people were left puzzled recently when DARPA made an urgent request for subterranean tunnels.
34
The openings, which were found near the Moon's north pole, could lead to an extensive network of tunnels.
1
Secret tunnels have been discovered beneath the stage of William Shakespeare's Curtain Theater in London.
11
Subterranean passageways once believed to be an urban legend have actually turned out to be real.
15
A subterranean complex covering an area of 5 million square feet has been unearthed in Nevsehir.
4
Undearneath the ancient capital lies a complex labyrinth of tunnels and quarries dating back millennia.