I hope so. As for the reason why people would venture away from the relatevely safe towns and into the dangerous caves and tunnels, I think there are many reasons~ Most habited places are isolated and don't communicate with others thus travelers will be rare. Heck even maps of the caverns will be basically near impossible to be found and etc... 

 It's gona be dangerous world... filled with darkness, monsters and insanity as the endless horrors in the caverns eat away most people's sanity~