Is there a “lake” below the Opera Garnier, Paris?
“When construction was finally started, it was just as quickly suspended after the discovery of an underground lake and spring. Although this problem was overcome, the lake persists and lies beneath the cellars of the building.” “The foundation stone was laid in 1861 followed by the start of construction in 1862. After numerous setbacks, construction was completed in 1874; it was interrupted by numerous incidents, including the Franco-Prussian War, the fall of the Empire and the Paris Commune. Another problem was the extremely marshy and swampy ground with underground water or an underground lake beneath the site, which caused continual pumping for eight months before the concrete foundation could be laid.
