They studied the strange scene awhile, then Randall said:
“Well, Frank, what shall we do about it?”
“Follow me,” said the young inventor.
Frank led the way around the gallery. It trended upward, and soon shot off at right angles into a serpentine course beyond the wall of the pit of fire.
It was as if this corkscrew-like passage had been bored for just such a purpose as it was now used. Frank led the way.
It was like ascending a winding stair in a tower. But before they had gone far Randall asked:
“Where are we going, Frank?”
“To follow this passage to its end,” was the reply.
“Where do you think it will end?”
“I don’t know. It may come out on top of the volcano.”