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Some Native Americans believe/d that Sasquatch like creatures dwelled underground in massive cave systems.
The Lost River is about 87 miles (140 km) long, and its name is derived from the fact that at least 23 miles (37 km) of the primary course of the river flows completely underground. The river's underground channels may in fact cover hundreds of miles, as the underground caverns have never been fully explored.
Divers exploring a maze of underwater caves on Mexico's Yucat‡n Peninsula have identified what may be the longest underground river in the world. The waterway twists and turns for 95 miles (153 kilometers) through the region's limestone caverns, said British diver Stephen Bogaerts, who made the discovery with German colleague Robbie Schmittner.
It is estimated that over 600 miles of unexplored cave may yet be discovered.