Note 4
Chapter XX · In the Cellars of the Opera
All the water had to be exhausted, in the building of the Opera. To give an idea of the amount of water that was pumped up, I can tell the reader that it represented the area of the courtyard of the Louvre and a height half as deep again as the towers of Notre Dame. And nevertheless the engineers had to leave a lake.
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.[4]
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