When Sweden and Denmark built a connection between their countries, Sweden preferred a bridge, and Denmark preferred a tunnel, they each built their half and connected them in the middle with an artificial island. The Øresund Bridge is unique in the world.
IIRC the Island is artificial and the reason a tunnel was made was because the entry point would be too close to the airport, endangering the airport and the bridge.
you are both right
Yes, I didn’t say they didn’t do anything, I only said “there’s an island and the waters are shallow”:)
But it’s generally cheaper to dig and cover, thatn to build in the air.