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In page Paris Métro Line 14:

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The southern extension of the line to Olympiades in June 2007, an area of high rise towers in the XIIIe arrondissement that was not served very well, was not a real extension: the tunnel was built at the same time as the rest of the line, but it was used as a train maintenance area, so a new maintenance area was constructed. The building of this extension caused the collapse of the courtyard of an elementary school; fortunately, no children were present on that day. Due in part to extensive mining for both gypsum and construction stone over two millennia, the underground of much of Paris is quite fragile and considerable care must be exercised before tunnelling work. (See Catacombs of Paris for further information.)