Bob had his flashlight in his pocket and at once switched on the light.
“We’re in a large cave, all right,” observed Joe, casting eager eyes about. “There’s another opening away over there,” pointing to the far side of the cave. “Let’s go through it and see where it leads us.”
The hole was so small that the boys barely got through crawling on their stomachs. But at last they reached the other side, and Bob turned the light ahead.
“Just another cave,” said Bob. “Chances are——”
“Wait!” started Joe, gazing at the darkness before them. “Let’s have some light over there.”
The beam was turned in the direction indicated by Joe, and the next moment the boys gave startled exclamations.
“A narrow passageway,” observed Bob. “Come on. We’ll see where it takes us.”
Suddenly, as they rounded a sharp corner, the youths came face to face with something that made them cry out in delight.
There, directly before them, was a large underground pool of sparkling water.