In this way, they gradually arrived beneath the huge cellars below the stage. They must at this time have been at the very bottom of the “tub” and at an extremely great depth, when we remember that the earth was dug out at fifty feet below the water that lay under the whole of that part of Paris. 6

The Persian touched a partition-wall and said:

“If I am not mistaken, this is a wall that might easily belong to the house on the lake.”