While this is all true, on a dollar-for-dollar basis, cut-and-cover is still cheaper than deep tunneling. There's no way around the fact that there is far more

While this is all true, on a dollar-for-dollar basis, cut-and-cover is still cheaper than deep tunneling. There's no way around the fact that there is far more expertise, equipment, experience and competition for digging holes compared to digging tunnels.