I do have a question, though: is it possible to save significantly on the cost of tunnelling if it were to be done in concert with a DRL? I am no engineer, but I always wondered if we couldn't combine the two projects in some way and possibly realize scale savings. But maybe the complications of such a complex project would actually increase costs.
If they are put in the same hole using cut-and-cover, then it would save money. This would be a trench about 40m or 50m wide.
If they are done by boring, then I would see no benefit.
