The 1910 Flood That Revealed Tartaria Under Paris

The Subterranean Structures Beneath Paris 1910 began as an urgent drainage operation following the catastrophic Seine flood that transformed the French capital into a network of canals.
Why do underground corridors maintain perfect alignment beneath multiple arrondissements? Why do sealed chambers appear in rock strata far older than Roman Lutetia? Why were entire subterranean networks filled with concrete, blocked off, and reclassified as "natural formations"? And why do official reports consistently omit infrastructure that recovery photographs clearly reveal?
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