human
I know the cleft in the rock, he said.
gpt
I have been over a small part of the passage to which it gives entrance. It was there, three years ago, in our attempt to undermine Lake Guatavita, that a charge of dynamite exploded, after which David Meudon disappeared. I had no idea that this passage extended back into the mountain as far as it does, according to Mr. Parmelee's story. But now--it strikes me, Mr. Leighton, that chance has given us the clew you were seeking last night. If you are still anxious to trace David's whereabouts, the path lies down the passage entered by Mr. Parmelee and his togaed, sandaled guide.
human
You want to explore it?
gpt
I do.
human
But why, if it was already known to you, have you not done this before?
gpt
The natives have always fought shy of going into it further than our mining operations made necessary. Besides, I never had any reason to suppose that it was more than a mere natural formation of rock--as it probably is--extending a short distance into the main body of the mountain.
human
And now?
gpt
I have no theory to advance. But, he added significantly,