One of KGB's largest events of the year, the Underground Tour aims to tell students everything that They won't tell you on the standard campus tours. All facts presented on the tour are entirely true.
The Underground Tour is held yearly, immediately after the Fall Activities Fair (okay, maybe not immediately... try the Friday after the Fair which is usually held on a Wednesday).
According to an ancient Pravda?, the UG Tour used to be very much longer (4+ hours! D:). In an attempt to make the tour less ridiculous in terms of length, then President Chuck "Timebomb" Werner and his exec board split the tour into two equal groups to cut time. We're not sure why they were equal and also less time (3 hours), but apparently it was a good decision.