All hurried to the place Roger had mentioned. It was an opening between some rough rocks, and was all of a hundred feet long and two to eight feet in width. How deep it was they could not surmise, for the walls curved from one side to the other, so that the bottom of the opening was out of sight.
“Looks to me as if it might be the entrance to some cave,” announced Ben, as all came to a halt on the brink of the opening. “Listen!”
The crowd did so, and at the bottom of the opening they heard a faint splashing of water as it poured over the rocks.
“Must be an underground stream down there,” remarked Phil.
“Perhaps it’s the same stream that furnishes water to the spring at our camp,” suggested Dave. He sent up a shout. “Hello, Shadow! Are you down there?”
“Help! Help!” came in a low voice from below.
“He’s down there, as sure as fate!” exclaimed Roger.
“Are you hurt?” shouted Phil.
“I’m pretty well scraped up, that’s all. But the rocks down here are all smooth and wet, and I can’t climb up—try my best.”
“You are in no danger just at present, are you?” questioned Dave quickly.