Listen, I don't want to be a "party pooper" here...
and spoil the mood I hope I've hopefully managed to get you into,
but whenever you have the time, you should maybe read
the "Why you should hire a licensed-guide" page in the "Good to know" section.
And it so happens that, at the Catacombs, only a guide can bring you to the restricted areas. I thought you should know.