Watch What It's Like Exploring Underneath Cities

If you've ever wondered what it's like to climb to the top of the Brooklyn Bridge at night, explore the sewers of Las Vegas, infiltrate a privately owned 80-story building in Chicago, or sprint through New York's subway, this video gives you a pretty comprehensive taster.

Made by SilentUK, this film, called Crack The Surface, takes a look at a small collection of urban explorers in the US who treat the city as a giant playground. As a bonus, it's also nicely produced. Filmed across New York, Indianapolis, Chicago, Las Vegas, Minneapolis and Montreal, it gives a great insight into what motivates these guys to do what they do, as well as relaying some fairly terrifying incidents along the way. Also, lighting fireworks in a small, enclosed, underground space is both stupid and amazing. [SilentUK]