Le sous-sol de Paris, si l’œil pouvait en pénétrer la surface, présenterait l’aspect d’un madrépore colossal. Une éponge n’a guère plus de pertuis et de couloirs que la motte de terre de six lieues de tour sur laquelle repose l’antique grande ville. Sans parler des catacombes, qui sont une cave à part, sans parler de l’inextricable treillis des conduits du gaz, sans compter le vaste système tubulaire de la distribution d’eau vive qui aboutit aux bornes-fontaines, les égouts à eux seuls font sous les deux rives un prodigieux réseau ténébreux; labyrinthe qui a pour fil sa pente.

The subsoil of Paris, if the eye could penetrate its surface, would present the aspect of a colossal madrepore. A sponge has no more partitions and ducts than the mound of earth for a circuit of six leagues round about, on which rests the great and ancient city. Not to mention its catacombs, which are a separate cellar, not to mention the inextricable trellis-work of gas pipes, without reckoning the vast tubular system for the distribution of fresh water which ends in the pillar fountains, the sewers alone form a tremendous, shadowy network under the two banks; a labyrinth which has its slope for its guiding thread.

—Victor Hugo, Les Misérables, 1890

Here’s a collection of photographs I took in the Mines of Paris, also known as the Catacombes around 2004 and 2005. These shots were taken under the 14th arrondissement of Paris, some of them under the Cochin Hospital.