Going underground: The massive European network of Stone Age tunnels that weaves

Not for the claustrophobic: Most of the tunnels are just 70cm wide - just wide enough for a person to slowly wriggle through

Some experts believe the network was a way of protecting man from predators while others believe that some of the linked tunnels were used like motorways are today, for people to travel safely regardless of wars or violence or even weather above ground.

The book notes that chapels were often built by the entrances perhaps because the Church were afraid of the heathen legacy the tunnels might have represented, and wanted to negate their influence.

In some cases writings have been discovered referring to the tunnels seen as a gateway to the underworld.

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