Dark Matter is believed to account for 80% of the mass of the universe. Whatever it is, it interacts gravitationally with normal matter, but is otherwise very hard to detect. At this underground laboratory, SNOLAB, in Canada, 2,000 meters below sea level (6,800 ft), scientists are searching for neutrinos as well evidence of Dark Matter in our part of the galaxy. Two kilometers of solid rock above protects the lab from all but what they search for. Welcome to their office.
Check It Out: The Search for Dark Matter at -2,000 Meters