The link you posted does not work... from what I am guessing I can think of two things;
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a) the 'brewery tunnel' belonging to a Brew House in Everton which had a tunnel for the barrels of beer to roll down a slope from the Brewery to the yard for transportation.
b) the proposed link to the city centre that would have come out at Everton. (I'm remembering this as I haven't got any books at hand) I think it was meant to come out somewhere near the top of Sleepers Hill
. It was meant to link up with the A580 (East Lancs Road) and be a direct access from Manchester to the Liverpool Docks and Mersey Tunnels, going under the city and down towards the Mersey.
As the project was proposed during the 1920s-1930's I believe that World War II got in the way, costs escallated and the plans were shelved.
As I said, I am remembering this so my facts might not be accurate.
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