Just saw an episode of 'Knight Rider' about a gang trying to rob the Federal Reserve of San Francisco using tunnels under the city dug by Chinese immigrants for smuggling purposes. Looks like there are tunnels under Chinatown in many cities:
cafemystery.blogspot.com/2010/02/san-francisco-chinatown-secret-tunnels.html
southsoundtalk.com/2017/04/25/stories-of-chinese-tunnels-in-tacoma-continue-to-this-day/
infamousnewyork.com/tag/chinatown-tunnels/
idahostatesman.com/news/article210321414.html
theculturetrip.com/north-america/usa/oregon/articles/a-brief-history-of-portlands-shanghai-tunnels/
weirdfresno.com/2009/06/underground-tunnels-found-in-fresnos.html
latimes.com/archives/la-xpm-2007-nov-26-me-tunnels26-story.html
bakersfield.com/news/the-legend-of-bakersfields-downtown-tunnels-truth-or-fiction/article_1e0428e9-68f7-5c1b-b27b-e0b914f61943.html