There are many stories of tunnels circulating. Many of them are just tales.
The Williamson Tunnels would be a good place to start also try and get hold of a book called Underground Liverpool by Jim Moore. The central library has a copy, it is the most authoritative work on subterranian Liverpool.
Possibly also look at the railways beneath Liverpool, sections of railway tunnel have been long abandoned such as the Crown Street tunnel at Edge Hill. Also the Metropolitan Cathedral has a huge crypt and storage space underneah it, also St Georges Hall has a mass of tunnels for it's ventilation system and of course the old quarry tunnels at St James Cemetery are worth a look.
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Good luck with the story!
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