I’m soooo envious of people who discover secret tunnels/rooms under (or in) their buildings.* The excitement! The history! The creep factor! It’s all good. There are certain cities where it’s just not that unusual, urban areas with long histories and reasons to have secret or underground spaces.
*Old tunnels, that is. Not discovering the neighbor has been secretly undermining your foundations with illegal excavations - that sucks. Or what sometimes happens in cities like New York, where a room/tunnel is uncovered, and it’s full of rats. Lots and lots of rats. On second thought, maybe I’m not so eager to find a secret room under my home.