"The water! It's getting deeper!" he cried
It was up to their knees now.
"Of course it getting deeper," said Frank, with a cheerfulness that he was far from feeling. "The tide isn't half in yet."
Andy shuddered.
"What will we do when it's high water?" he asked.
Frank did not answer, but kept on chipping away at the rock. He managed to break off several pieces, but it was easy to see that it would take much more work to loosen the retaining ridges so that the bowlder that imprisoned them would fall outward.
"There it goes!" suddenly exclaimed the older brother in despair.
"I've broken my knife blade! You'll have to do all the work, Andy."
"Oh, what's the use?" sighed the younger lad. "The water is coming in faster. See, it's up to our waists now, and the tide is nowhere at full! We're doomed, Frank!"
"Not a bit of it. See that ledge of rock up there? We'll climb up on it and wait until the water goes down. Then maybe someone will come for us, or we can get out. Climb up, Andy. We won't try to break off any more rock."
Frank helped his brother to take a position on the narrow ledge. It was barely wide enough for two, but, somehow, they managed to cling to it. The surface was wet, and there were little puddles of water here and there. Seeing them in the gleam of his light, Frank could not repress a shudder.