The Williamson Tunnels were a series of tunnels beneath Liverpool, built under the direction of Joseph Williamson.
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Williamson was working on the tunnels in 1820. James Stonehouse argued that they were without purpose, though Williamson argued that he was preparing for "the cataclysmic". (TV: The Halloween Apocalypse) Williamson had, in fact, discovered a series of portals underground. Having seen the effects of the Flux in the future, he sought to build the tunnels as a means of navigating the different zones and to start an underground city that would provide shelter from the apocalypse. (TV: The Vanquishers)
Alfie's granddad, who was working on the construction, reckoned there were dining halls and bedrooms. According to some claims, there was an army in the tunnels. (TV: Survivors of the Flux)
After Joseph Williamson's death, that took place long before 1904, the tunnels were shut down and all the work was stopped. (TV: Survivors of the Flux)
In 2021, the Williamson Tunnels were being excavated. By that time they had become a tourist attraction. (TV: Survivors of the Flux) The Museum of Liverpool contained an exhibit on the Williamson Tunnels. (TV: The Halloween Apocalypse, The Vanquishers)
During the 2021 Sontaran invasion of Earth, the human resistance used the Williamson Tunnels as a headquarters. Kate Stewart later used the tunnels to capture the Grand Serpent and force him through one of the portals. (TV: The Vanquishers)
Behind the scenes
In the real world, the tunnels' true purpose is unclear, and is the subject of much academic speculation.[1]