There’s a neat story in the Boston Globe about the first tunnels built for the T, Boston’s subway system. Some of the tunnels built in the late 19th and early 20th century but long since abandoned are like little ghost towns. Subterranean Pompeiis, if you will.
Others have been refurbished for use as a power station, testing facility for new subway features, or for emergency drills.
Over the years, crews have come through the old Tremont Street tunnel to run utility lines or, in recent years, to consider and then reject the possibility of fitting high-speed Silver Line buses in the narrow tunnels. There is also a large mound, probably 15 feet high, of rusted-out 10-gallon water and biscuit containers that date to the 1960s, the height of the Cold War, when the tunnel was considered a nuclear fallout shelter.
Check out the tunnels in this video: