Five stories below the streets of Odessa, there's a labyrinth of tunnels. 1,500 miles of them have provided, in the best of times, a challenge for urban explorers like Roman Mauser. In the worst of ...

Add Yahoo as a preferred source to see more of our stories on Google. Old stone mines underneath Odessa, Ukraine - which residents call the "catacombs" - have long sheltered the city's inhabitants in ...

The Ukrainian port city of Odesa sits atop a labyrinth of catacombs—technically, limestone quarries—which constitute perhaps the world’s largest network of urban tunnels, extending ten stories deep ...