I guess the Williamson tunnels were limited at most to the extent of rock outcrop in the area (obviously because they would not be self supporting otherwise). I understand that there are also tunnels under the Anglical Cathedral within the rock outcrop there.
I know there is an outcrop not far from the Pig and Whistle around about Martins Bank in Water Street (and the basement would flood there if it were not for the concrete walls) which would possibly run down Castle Street to the Castle (Victoria's monument). It would be very diffciult to sustain a tunnel elsewhere ie. through the weathered rock and silt going down to the docks and river.
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In theory there ought to be a continuous rock outcrop from the Anglican Cathedral around to Everton brow taking in Edge Hill (and the Williamson Tunnels) plus a spur on the other side of the pool feeder river running towards the Castle from the foot of Everton Brow - but it's all guess work unless someone could source a geological map and overlay it with the 'theories'?
I had also heard that there were tours (???) of below ground 'caves' running along Strand/ Strand Street which would tie in with the theory that they are actually shoreline erosions from below of the land-fill built up to make the docks ie., the land fill has been eaten away from below by the tide leaving a 'crust' on top!
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