With dripping head and shoulders above the water, Frank was compelled to laugh at the sleepy-eyed, wondering expression on the blue-jowled face of his friend. "Thought you were dead to the world," he returned, "you old sleepy-head. And I don't know where we are, excepting that it is somewhere under the silver dome. What's more, I don't much care. You should get into this water. It's great!" * * * * * So saying, he dived to the bottom of the pool and stood on his hands, his feet waving ludicrously above the surface. Tommy sniffed once and then made a quick dash for the pool in his own room. He was not to be outdone by his more energetic partner. A half-hour later, shaved and attired in their own garments, which had been cleaned and pressed and hung neatly in the closets, they settled themselves for a discussion of the situation. Having tried the doors of both rooms and found them locked from the outside, there was no other course open to them. They must await developments. "Looks like Leland has quite an establishment down here inside the mountain," ventured Tommy. "Hm!" snorted Frank, "this place is none of Leland's work. He is probably a prisoner here, as are we. He just stumbled on to the silver dome and was captured by whatever race is living down here beneath it, the same as we were. Who the real inhabitants are, and what the purpose of all this is, remains to be seen." "You think we are in friendly hands?" "These quarters do not look much like prison cells, Tommy, but I must admit that we are locked in. Anyhow, I'm not worrying, and we will soon learn our fate and have to be ready to meet it. The people who own this place must have everything they want, and they sure have some scientific knowledge that is not known to us on the surface." "Wonder if they are humans?" "Certainly they are. You never heard of wild beasts sleeping in beds like these, did you?" * * * * * Tommy laughed at he examined the exquisite hand-wrought figures on the silver bedstead. "No, I didn't," he admitted; "but where on earth did they come from, and what are they doing here?" "You ask too many questions," replied Frank, shrugging his broad shoulders. "We must simply wait for the answers to reveal themselves." There was a soft rap at the door of Frank's room, where the two men were talking. "Come in," called Frank, chuckling at the idea of such consideration from their captors.