The Custodial Services hosts tours of the campus tunnel network. Used to travel across the campus in bad weather, or as a well-established site to practice hacks, the system was designed as a route for utilities such as steam pipes. The Class of 2009 version of the Brass Rat has a map of MIT engraved on the underside of the bezel, but instead of the more usual MIT campus map, the 2009 Ring has a Hacker's map, which shows each tunnel and basement as they are connected on campus.
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