The Pizza Underground formed in 2012 as a joke, according to percussionist Deenah Vollmer who plays an empty pizza box.
Italy also has considerable areas in which, as a result of porous rock, the water systems run underground, forming subterranean streams, sinkholes, and lakes.
But many of the writers, particularly the younger ones, argue that the Web has helped transform graffiti culture from a localized, underground form of expression into a wider movement.
Further, the chemical persists underground, forming long-lasting plumes that may harm wells long after states enforce plans to stop blending MTBE into their gas.
Water moves underground, forming complex physical, biological, and chemical connections, only to reappear in wetlands and other waterbodies.
Although an influential phenomenon on hardcore punk and other popular genres, grindcore itself remains an underground form of music.
"I think the general impression for a long time has been that rap is an underground form of music primarily purchased by African-Americans, but that's just not the case," says Mike Fine, co-owner of the New York-based research firm Sound Data.
Urban underground space forms a societal asset, which is often unappreciated and underestimated in terms of the role it can play within dynamic city environments and associated challenges.
Just beyond this ring, ramps lead to underground parking, forming a kind of moat between the buildings and the street.
