underground

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References in classic literature ?
You have plenty to do trying to rule your underground kingdom.
This same Belt had once enabled Roquat the Red to carry out many wicked plans; but that was before Ozma and her people marched to the underground cavern and captured it.
I calculated that we were in a narrow circular gallery, probably running all round the Opera, which is immense, underground.
Yes, but I knew that all that existed and that there was nothing supernatural about that underground lake and boat.
It's an underground passage all right," said Professor Bumper eagerly; "and not a natural one, either.
Sometimes, he says, there is a secret way of opening stone doors in these underground caves.
He is said to be the Ruler of the Underground World, and commands the rocks and all that the rocks contain.
There were three circumstances in particular which made me think that its rare emergence above ground was the outcome of a long-continued underground habit.
He soon grew to love me, and for thirty-nine days we spent as pleasant an existence as could be expected underground.
When the seven years had quite gone, the Fiend came with his book, and, pointing at the signatures, said, 'I will take you underground with me; you shall have a meal there.