When Sir George finally reappeared he had a startling proposition for them. A new kind of expedition was to be launched, not into space but into the depths of the earth. The astronauts were about to become 'subterranuts'. Or rather one of them was, for only one man could enter the capsule which was to carry him down the Mohole, the borehole which had been drilled twenty-one miles into the earth, to end in a huge underground cavern...
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