"I knew something had happened to Steve," he said. "Something has happened to him." Mr. Penton had not spoken since the cage started. He, too, was thinking deeply. There was something about all this that he could not understand, though he was unable to clearly define what really was in his mind. If someone had called Steve Rush to come to the sub-level above the lower level, and had done so in the name of the superintendent, it must have been done either as a joke or for some other purpose that could only be surmised. "Why should anyone have resorted to such a subterfuge?" wondered Mr. Penton. Very much the same thoughts were running through the mind of Bob Jarvis. So engrossed was each with his own thoughts that neither man seemed to realize the dizzy rate of speed at which they were descending. Finally the cage began to slow down gradually, then finally came to an easy stop. There was no light in that sub-level, but the occupants of the cage knew exactly where they were. They knew the place as well as though the sub-level had been ablaze with light. "All off," ordered the superintendent. "The cage will wait for us here." He had given orders that the cage was to remain below until he signaled the tender to hoist. If the latter found it necessary to raise the cage before that he was to ring a certain signal on the gong, each level and sub-level being provided with one. "All hands keep their eyes open," directed the leader of the searching party. "I haven't much hope that we shall find him here, however." The group moved along the sub-level, glancing about them keenly as they did so, until they reached the turn or bend in the tunnel, where they paused to listen. The sub-level was as silent as a tomb. They could not even hear the rush of the water as it dashed into the lower level, some of it coming all the way from the surface. "Shall I call out?" asked Bob. "Yes." "Steve!" Bob's voice did not seem to carry far. It sounded weak to him. "Oh, Steve! Steve Rush!" shouted the superintendent. There being no response, he repeated the call several times, but with no better result. "I guess it is useless, boys. I am afraid we shall not find him here. In fact, I can't believe that he came down here at all." "The boy said you had telephoned to Steve to come down, didn't he?" asked Jarvis. "Yes; but I did nothing of the sort. The telephone man must have made a mistake in the message--or else----" Mr. Penton checked himself sharply. "We will look further, though I am sure we are wasting time. We shall probably find that he has fallen somewhere on one of the upper levels and hurt himself. If that is so, one of the watchmen is sure to discover him and report the matter at once. We will go out to the platform, then on up to the next level. I'll have all the watchmen notified at once to take up the search."