A double stacked tunnel though some were triple stacked there are also many that were built of sandstone.
The tunnels had since the death of Williamson been back filled with building rubble though recognised as a signifcant part of Liverpool history 2% of the tunnels have been excavated by hand with wheel barrows.
Some may never be open to the public due to instability caused by water ingress etc.
http://www.williamsontunnels.co.uk/
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