Shanghai tunnels mostly a myth...or are they?

In the glory days of Portland shanghaiing, sailors were 'helped back aboard ship' on the city streets; there was no need for a tunnel to sneak them down to the docks. But the tunnels under the saloons and streets were useful for lots of other shanghaiing-related activities ... (Portland, Multnomah County; 1890s) (For text and pictures, see https://offbeatoregon.com/1905d.shanghai-tunnels-based-on-true-story-549.html)