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Rh as sure as I live. Why—why what does it mean? Where in the world are we? What has happened?"

"It means that we're back at the surface all right, Perry," I cried; "but where, I don't know. I haven't opened her up yet. Been too busy reviving you. Lord, man, but you had a close squeak!"

"You say we're back at the surface, David? How can that be? How long have I been unconscious?"

"Not long. We turned in the ice stratum. Don't you recall the sudden whirling of our seats? After that the drill was above you instead of below. We didn't notice it at the time; but I recall it now."

"You mean to say that we turned back in the ice stratum, David? That is not possible. The prospector cannot turn unless its nose is deflected. If the nose were deflected from the outside—by some external force or resistance—the steering wheel within would have moved in response. The steering wheel has not budged, David, since we started. You know that."