There may be a peaceful and friendly person speaking to you as a guide.

Any of those inviters is a party to a plot to shoot you dead or to serve drink mixed with a narcotic never to recover consciousness.
You had better simply think there is no exception. Whatever their occasional causes are, every attempt to take you into the underground could be the trick to murder you or to put you to sleep for ever.
There is a pressure of the underground's plan and many people needing to increase the number of victims.