[Image: Courtesy of the Nottingham Caves Survey].

[Images: Courtesy of the Nottingham Caves Survey].

[Images: Courtesy of the Nottingham Caves Survey].

[Image: The scanner at work; courtesy of the Nottingham Caves Survey].

Some new images of the ongoing laser-scan project taking place in the caves beneath Nottingham, England, have been released. "The Nottingham Caves Survey is in the process of recording all of Nottingham’s 450+ sandstone caves," the organizers explain.From malting caves and circular kilns to a 19th-century underground butcher , via the Shire Hall and, of course, Mortimer's Hole , it's intoxicating to imagine a city whose most exciting discoveries lie somewhere far below its own streets and urban surfaces, in a delirious sprawl of artificially enlarged sandstone caves.Check out this video, below, which is basically just a fly-and-walk-through of the resulting scans.Like the short film La Subterranea , which we screened a few years back at the Silver Lake Film Fest , the video suggests a fundamentally porous urban world in which, as Alex Trevi writes, "day and night, laser scanners that have gone mobile will be deployed into these voids, and bit by pinprick bit, these labyrinths that once confounded, concealed and even consumed trespassers with their disorienting mazes will resolve into total comprehensibility. Every detail will be known to you."The city, CAT-scanned, becomes a labyrinth of complete transparency.Imagine, for instance, a city consumed by its own archaeology—a hole complex of obsessive-compulsive excavation—where the streets are just the thinnest of bridges spanning a sponge-like void below.For more, check out the site of the Nottingham Caves Survey , which has link after link after link to explore; perhaps start with their Cave Map and move onward from there.All in all, this might be the best advertisement for a city—intentional or not—that I've ever seen: drawing people to visit based on quasi-holographic laser scans of that city's underground history.