Awww Ross, spoilsport
Dunno how long Alexander wants to make the tunnel though. We have looked at minimum length to deliver an effective reconnection between Town and Seafront and tunnel combined with anciliary junction works and local road reconstruction for retail, restuarant and entertainment viability and sustainability should come to approx. £150m. I have to emphasise that this is the minimum requirement for delivery of an effective reconnection. Ideally the tunnel would be longer, but a longer tunnel section is just not deliverable (initial cost budget (for a road tunnel with no immediately discernable commercial ROI) would cause the whole to be abandoned as overly ambitious).
Even the minimum tunnel length required to provide an effective reconnection will be many years in the making, between initial detailed planning and final delivery. Just getting the right partners and finance together in the first place I know will be a major, and time consuming, project.