Once more they began descending the steps.
During all this time they had not heard the least sound from those who had preceded them.
Probably one hundred and fifty steps more were descended, and then they reached a wide passage.
“Come,” said Leo, leading the way. “We have struck level traveling at last.”
The swamp explorers had not proceeded over three hundred yards, before they saw daylight ahead.
It seemed rather strange that it should be daylight, but it was, nevertheless.
With all possible speed they hastened along the passage.
Two hundred yards more and a wonderful sight met their gaze.
They were emerging into a vast tract of country many feet below the earth’s crust.