It bears pointing out that we don't even know yet whether or not this will even be built. There must have been something learned in the construction of the worl

It bears pointing out that we don't even know yet whether or not this will even be built. There must have been something learned in the construction of the world's current longest undersea tunnel, http://en.wikipedia.org/wiki/Seikan_Tunnel http://en.wikipedia.org/wiki/Seikan_Tunnel and one thing the whole world learned from that is that such projects can take decades from planning to completion.