Odessa Catacombs  From Wikipedia, the free encyclopedia Jump to:
navigation, search Nerubayskoe 04.jpg  The Odessa Catacombs is a
network of tunnels that consist of three levels, stretching out
under the city and surrounding region of Odessa, Ukraine. The
majority of the catacombs are the result of stone mining. The
Catacombs reach a depth of 60 m below sea level.  Most of the
city's 19th-century houses were built of limestone mined nearby.
Abandoned mines were later used and widened by local smugglers.
This created a gigantic labyrinth of underground tunnels beneath
Odessa, known as the "catacombs".  Today they are a great
attraction for extreme tourists, who explore the tunnels despite
the dangers involved. Such tours are not officially sanctioned
because the catacombs have not been fully mapped and the tunnels
themselves are unsafe. There have been incidents of people
becoming lost in the tunnel network, and dying of dehydration or
rockfalls.[1]  The approximate topography of the Odessa
underground labyrin