Check this one out. https://www.youtube.com/watch?v=HCT-FurFVLQ
Same transit authority. Not sure if the cost would warrant it. "Suspended underwater tunnel." 😳😳😳
Parts of it have been or will be built.
Other parts won't ever be, at least not in my lifetime.
All those tunnels certainly reduce the enjoyments of motorcycling!
Although I do get a kick out of entering a long and deep underwater tunnel, and after a long ride, going deeper and deeper and maybe then level for a while, I reach an intersection, where I can choose where to go. Right, to town A, one mile before I'm above the sea level again, or left, to town B, ditto.
A good thing about these projects us that they make riding on the old roads better as there's much less traffic on them.