The word catacomb comes from Greek kata kumbas (L. ad catacumbas), "near the low place" and originally it meant a certain burial district in Rome. It can refer to any network of caves, grottos, or subterranean place that is used for the burial of the dead, or it can refer to a specific underground burial place.
In Ukraine and Russia, catacomb (used in the local languages' plural catacomby) also refers to the network of abandoned caves and tunnels earlier used to mine stone, especially limestone. Such catacombs are situated in Crimea and the Black Sea coast of these two countries. The most famous are catacomby beneath Odessa and Ajimushkay, Crimea, Ukraine. They served as bases for SovietWorld War IIguerillas (see also Great Patriotic War). Ajimushkay catacombs hosted about 10.000 fighters and refugees. Many of them died and were buried there, and memorials and museums were later established (it is now a territory of Kerch city).
Crypt of the Sepulchral Lamp in the Catacombs of Paris.
The section of the catacombs open to the public is only a small part of an extensive network of underground tunnels, which spans more than 300km (about 186 miles) in length.
The catacombs in the game's world are home to a clandestine group of French revolutionaries named Silhouette, who make their home in the German World War II bunker.
In Ukraine and Russia, catacomb (used in the local languages' plural katakomby) also refers to the network of abandoned caves and tunnels earlier used to mine stone, especially limestone.