No, not in the Science Fiction terms. However, there are many cities with extensive underground parts.
Seattle and Atalanta have Underground cities. You can take a tour of Seattle Underground.
No! usa is not underground,but some cities ,hotels,etc are underground.
Water collects underground by slowly seeping through the ground until it reaches hollows of the earth where it can collect. These are often called aquifers and are major sources of water for cities.
Cities of the Underworld - 2007 A-Bomb Underground - 2.3 was released on: USA: 11 February 2008
Who Knew - 2010 Underground Cities 3-5 was released on: USA: 5 January 2011
In huge underground lakes and rivers. Also, underground the Earth.
Cities of the Underworld - 2007 Freemason Underground 1-9 is rated/received certificates of: Singapore:PG
toronto,ottowa
Cities of the Underworld - 2007 A-Bomb Underground 2-3 was released on: USA: 11 February 2008
Cities of the Underworld - 2007 Underground Apocalypse 2-1 was released on: USA: 28 January 2008
Cities of the Underworld - 2007 Underground Bootleggers 1-12 was released on: USA: 23 July 2007
Cities of the Underworld - 2007 Dracula's Underground 1-10 was released on: USA: 9 July 2007