I had an uneasy feeling that we were being watched, and that every movement we made was plainly seen by a gigantic but invisible spectator, very much the kind of feeling, I suppose, that insects must have under the microscope. I felt sure that we were not going to have it all our own way with this quiet island. Duncan hesitated for a moment, but I was insistent that we should take a look at our landing place before we left our cover. It was a characteristic of Duncan that as soon as he had discovered what he wanted, he became as forthright a sailor as you could wish to find; and I knew that if we were to escape with whole skins, or even to make use of our discovery, I should have to exercise my own wits. Fortunately, my own "impressions" began when his finished; for, after he had yielded to my persuasion, we made a slight circuit through the woods, and crept out through the long grass on the top of the little cliff, overlooking the beach where we had landed. Our clams were still there, in two neat little dumps. So was the launch, but in the stern of it there sat a tall red-bearded man, who looked like a professor, and a couple of sailors. They were all three talking German in low, excited tones, and they were all three armed with rifles. The launch lay almost directly below us, and we could hear some of their conversation. I gathered that the luncheon party had gone on board a U-boat which had just arrived, to inspect the latest improvements. Something had gone wrong. They had submerged; and it seemed to be doubtful whether they could get her up again. That, of course, was why the house was deserted and our trespassing unforbidden. It was probably also the reason why the sentries had been absent, and had only just discovered our launch on their rounds. One of the sailors was aggrieved, it seemed to me, that no effort was being made to obtain other help for the submerged men than the island itself could lend. His best friend was aboard; and he thought it wicked not to give them a chance, even if it meant their internment. The red-bearded professor was explaining to him, however, in the most highly approved style of modern Germany, that his feelings were by no means logical; and that it was far nobler to sacrifice one's friends than to endanger the State. "But, if the State is a kind of devil," said the sailor, who was a bit of a logician himself, "I prefer my friends, who in the meantime are being suffocated." "That is a fallacy," the professor was answering. Then, from the direction of the house, there came a confused sound of shouting. A fourth sailor came tearing down the beach like a maniac. "Where are the clam-fishers?" he called to the three philosophers. "They are to be taken, dead or alive."