First tunnel element of the Fehmarnbelt Tunnel immersed

I'm amazed that engineers can make submerged tunnels work and that leaks don't (literally) sink the whole plan.

52.6B krone for 18 km

8B USD for 11 miles

CACHSR IOS 36B USD for 171 miles.

The Merced to Bakersfield IOS looks like a bargain on a distance basis. I have no idea of the carbon offset or passenger time saving versus flying of course