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  * The passages between the cave exits are hand-dug by either a team of kindred or some sort of huge underground predator.  
  * Gas-powered railway carts are typically used to travel between cave entrances at high rates of speed.  
  * All these connecting passages are tight one-way affairs.  If two beings meet one another along the way, they must find a natural break in the passage for one to step off so another may pass.  Unfortunately, these pass-ways are few and far between.
  * There are a variety of other entrances and exits from this system that are not common knowledge, and might be havens to other kindred.