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guess. But
most likely they would ask awkward questions. On the other hand the new outlet，the one for the invasion of Overworld，was on this side of the sea，and only a few miles away. The Prince knew that it was nearly finished；only a few feet of earth divided the diggings from the outer air. It was even possible that it had now been quite finished. Perhaps the Witch had come back to tell him this and to start the attack. Even if it was not，they could probably dig themselves out by that route in a few hours—if they could only get there without being stopped，and if only they found the diggings unguarded. But those were the difficulties.
“If you ask me—”began Puddleglum，when Scrubb interrupted.
“I say,”he asked，“what’s that noise ？”
“I’ve been wondering that for some time ！”said Jill.
They had all，in fact，been hearing the noise but it had begun and increased so gradually that they did not know when they had first noticed it. For a time it had been only
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