Interesting, but its seems more apt to
Dark Conspiracy or
Call of Cthulu.
Still, it could provide a (comparative) shelter from surface radiation for a community still living in Liverpool...
One of the notes in the Wikipedia page leads to an 1863 book
Recollections of Old Liverpool, which has a chapter (X, starting on pg 183) of text descriptions of the tunnels by an eye witness, for the interested.
Uncle Ted