I've been reading a lot about all the abandoned tunnels in Philadelphia. There are a bunch of them near city hall.
The Arch Street subway line is near City Hall.
https://hiddencityphila.org/2018/04/ghosts-of-the-abandoned-arch-street-subway-line/
https://www.newspapers.com/image/718792394/?terms=Ron%20Desantis&match=1
The Bradenton Herald
19 Dec 1987, Sat · Page 15