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More underground cave systems

Check it out http://en.wikipedia.org/wiki/Shanghai_tunnels

The Books of Sigler that i Own: EarthCore(2005) | |Ancestor(2007) | | Infected | | Contagious | | Ancestor(2010) | | The Rookie | | The Starter | | The All-Pro | | Blood is Red | | Nocturnal (Pre-Order) | | {+ I bought a copy of all the above for my dad