Noel looked up and saw a square opening, revealing a deep recess, exactly opposite a window in the rock which threw light into it.
"Yes, it is like a room," Noel said, adding, with a sigh of relief, "but there's no way of getting into it."
"I daresay I could climb up," said Duke; but the straight smooth wall of rock seemed to offer no foothold.
Though he would not allow it was impossible, Duke made no attempt to reach the rock chamber. When they had fully examined the inner cave, there seemed no opening for further exploration, and Duke was willing to return. Noel hurried back eagerly, and was thankful to find himself once more in bright sunshine.
Almost the first thing he saw as he came out of the cave was a boy disporting himself in the waves.
"Oh, look, Duke!" he cried. "There's a boy bathing. He can't know that it's dangerous to bathe here."
"I don't believe it is dangerous to-day," said Duke; "it doesn't look so."
"Oh, but you know Box says that there is always a dangerous eddy at that point. Don't you think we ought to warn him?"
"All right," said Duke, quite willing to make acquaintance with the young stranger, who seemed to be a year or two older than himself.
"I say, boy, whatever's your name!" he shouted. "Don't you know it's dangerous to bathe off this beach? Look out for a groundswell—do you hear?"