The posters are among a number of art pieces regularly placed on advertising boards on the underground by Art Below.

BBC: Margaret Thatcher art posters banned from Tube

But he claimed that rescue operations of this nature are not unusual in a country where there is still more art underground than overground, and where archaeologists must battle the twin threats of rampant development and violent looting.

ECONOMIST: Chinese archaeology

The commission, from Art on the Underground, is part of celebrations to mark the Tube's 150th anniversary.

BBC: Mark Wallinger unveils labyrinth Tube art

How can we write without the old serious publications, make movies without risk-taking Hollywood producers, live without cheap urban housing, discover art without the underground, make a career without the circulation-desk jobs?

NEWYORKER: What She Said

The developer offered to build a 100-acre park and donate it to the city--if it got permits to build an underground parking garage, a nature center and an art museum.

FORBES: Scratch Builders

He told Australian media the prospector had been using a state-of-the-art metal detector, which meant he was able to find the gold relatively deep underground in an area which had been searched many times in the past.

BBC: The gold nugget found in Ballarat