GV27:
I'm still convinced that the main motivation for undergrounding was to enable the need for tunnels under the Harbour, or at least a continuation of work programs relating to them.
And I still don't know why we would do that ... a tunnel is (obviously) less visible than a bridge but you can make a pretty bridge and it's vastly cheaper than a tunnel. It's also arguably much safer than a long tunnel in regards to emergencies.