He was alarmed beyond measure by what he saw. There was no sun visible, yet the sky did not seem heavily overcast. A strange, coppery light seemed to filter through an unusually thin but very absorbing mist that spread over the whole heavens. The sea had been very still throughout the night. Apparently, a calm had extended far and wide over the waters. There was always some slight motion on the shore, and the silken slithering of the waves on the barrier came to him very faintly. The absence of any wind at all had aroused no attention. There was no wind now, yet the surface of the deep was troubled.
After he had washed the girl's feet and hands and had set her down on the sand, his attention was attracted by a sudden resounding crash on that stretch of barrier that he could see through the entrance. It was as if some mighty heave had raised and lowered the surface of the ocean. As he stared seaward, he thought that the mist was thickening on the horizon. It was growing darker there. Indeed, on the line where the sky and sea would have met on the horizon, if he had been able to see, it was suddenly black dark. The sun was more than an hour high, he judged, although he could see nothing but the coppery light through the mist, and the mist was in rapid wraith-like motion far above his head and far beyond the reef. He could see that clearly enough, although even yet no wind came to him.
Presently, there was another of those long, swinging undulations, which broke with tremendous force on the barrier, sending a cloud of water and spray twenty feet into the air. It was uncanny. There was no cause for it. It was as if some subterranean monster had turned over in the depths and upheaved the surface. Truda joined him.
"I never saw anything like that before, and I have seen the sea ever since I was a child," she said. "The waves broke on the rocks, but not like this. It is so still. Oh, look."
Another of the great undulations struck the reef, and a gust of wind from nowhere, apparently, and gone almost as quickly as it had come, carried the spray across the lagoon and into the still harbor. They saw it patter upon the smooth surface. They marked the wide circles spread, interlace, break. It was a warning to the man, at least.
"Some terrible storm is brewing," he said. "If it equals the promise of these waves, it will flood this gulf. We must seek shelter."
Now he had marked before--indeed, in his first exploration he had essayed to get to the top by it--a broad shelf of rock fifty or more feet above the level of the sea. It was inconceivable that any tide or storm could ever reach that shelf.
"We must go there and wait," he said.
The ascent was not particularly difficult for a man alone, but burdened as he was with the girl, it was almost impossible. He carried her up in his arms as far as he could that way and then set her down.
"You can leave me here," she urged.