Four-panel illustration of an underwater scene. Top panels show water surface and a large rock. Bottom panels show a person snorkeling near rocks.

a four panel storyboard of this passage; "Under him, six or seven feet down, was a floor of perfectly clean, shining white sand, rippled firm and hard by the tides. The great rock the big boys had swum through rose sheer out of the white sand—black, tufted lightly with greenish weed. He could see no gap in it. He swam down to its base. Again and again he rose, took a big chestful of air, and went down. Again and again he groped over the surface of the rock, feeling it, almost hugging it in the desperate need to find the entrance. And then, once, while he was clinging to the black wall, his knees came up and he shot his feet out forward and they met no obstacle. He had found the hole." See more