What constitutes a storm drain? What about a catacomb?
Drains are underground, (mostly) cement tunnels meant to transport storm water (not human waste). Drains are sometimes also called storm sewers. Catacombs, found mainly in Europe, are subterranean mazes which serve as underground gravesites. (The word catacomb seems first to have been applied to the cemetery under the basilica of St. Sebastian near Rome.) Drains and catacombs don’t have much in common in terms of function, but the tactics for exploring the two areas are similar.
