The cost of the tunnel and stations is estimated to be $750 million. If this tunnel is built for that price, pigs will truly fly. The first rail project had a fixed-price contract, so that the contractor -- Siemens et al. -- would cover any overruns. You won't get that for a tunnel because there are too many risks, such as surprise geology or water.
I certainly agree about the pigs! They could also throw in a congestion charge, like London, England.