Underground

Singapore has built skywards and taken back land from the sea to accommodate its booming population. But as the city-state runs out of options for future growth, it's looking underground to build infrastructure, offices, and even public spaces.
Sep 26, 2013   The New York Times
The immense drill that's burrowing a subway tunnel beneath New York City will remain underground after its work is through, a move to cut the expensive costs of removing it.
Jul 26, 2011   The New York Times
Sidewalks in Holland have for years utilized piped-in waste heat to melt snow. Now, they've added an additional sidewalk amenity: a hearth.
Apr 14, 2011   Metropolis
The city of Helsinki has developed a master plan for its burgeoning underground city.
Feb 24, 2011   The Huffington Post
Construction is nearing completion on the longest railway tunnel in the world.
Feb 21, 2011   National Geographic
A new video features urban explorer Steve Duncan as he adventures in the abandoned subway tunnels beneath New York City.
Jan 6, 2011   Wired
Officials in Finland are building a nuclear waster storage facility that is designed to last for at least 100,000 years.
Nov 13, 2010   CNN
A six month trial will bring Wi-Fi Internet access into test locations within the London tube system, part of an effort by the city to bring Internet access to the entire system in time for the 2012 Summer Olympics.
Nov 4, 2010   BBC
103 artists form around the world have unveiled a massive collection of murals in New York City. But they're underground in abandoned subways stations, and you can't go see them.
Nov 4, 2010   The New York Times
<em>The Atlantic</em> guides a tour through the underground business zone of SubTropolis, a 5-million-square-foot complex 100 feet below Kansas City, Missouri.
Apr 15, 2010   The Atlantic
The winner of the SHIFTboston Ideas Competition is a proposal to turn the unused Tremont Street Subway tunnel under Boston Common into a network of underground cultural venues.
Feb 11, 2010   Metropolis Magazine