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Scientists have found evidence of a subterranean labyrinth of tunnels hidden beneath the planet's surface.
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Saturn's moon Titan may be home to habitable subterranean pockets of liquid water.
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The secretive tunnel would have been used by Roman emperors to make a quit exit from the legendary arena.
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Congressman Tim Moore recently posted a video showing a secret staircase leading down into a hidden tunnel.
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Spanning 3,400 miles, the tunnel would be the most ambitious infrastructure project ever undertaken.
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The ruins of an ancient city in southern Mexico have yielded evidence of long-lost underground tunnels.
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Some very strange and potentially very painful sea creatures have been found along the Gulf Coast.
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East London's Blackwall Tunnel, which stretches underneath the Thames, remains a hotspot for ghostly tales.
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The group of thieves had intended to steal and sell the oil by digging directly to the pipeline using primitive tools.
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Archaeologists have unearthed one of the most important discoveries of recent years - a huge tunnel beneath a temple in Egypt.
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A mind-boggling optical illusion in a tunnel in the US left one driver so perplexed that he didn't want to drive on.
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A new paper has put forward a radical new theory to explain mysterious magnetic structures in the sky.
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A married man in Mexico dug a tunnel connecting his house to that of his mistress so that he could visit her.
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A mother in Ukraine attempted to break her son out of jail by single-handedly digging an escape tunnel.
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An eagle-eyed Google Earth user has identified what appear to be several underground tunnel entrances.
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Archaeologists have unearthed a mysterious 19th-Century tunnel hidden beneath a station in Denmark.
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A group of anonymous individuals have been digging tunnels in search of evidence of 'giants' in New Zealand.
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Many people were left puzzled recently when DARPA made an urgent request for subterranean tunnels.
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Authorities were left perplexed this week after discovering a carefully dug tunnel outside a Florida bank branch.
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NASA has proposed a new mission to delve deep beneath the icy crust of Jupiter's moon Europa.