I am not sure if either side wanted their solution all the way, but the connection between us are a combined one with bridge and tunnel.
On the great belt bridge its the same for trains, after they crossed the main span of the bridge from the west the tracks go down a tunnel, but the cars stay in the sun all the way.
I dont even think its the same TBMs ( Tunnel Boring Machines ) that was used for both bridges, actually come to think of it the tunnel part of the bridge to Sweden are concrete tubes sunk down in a trench dug in the mainly chalky bottom.
Its also the same approach they want to take with the connection to Germany.
Here is a video of the drive across from Denmark to Sweden, the bridge are off course on the Swedish side of oresund so passage for ships are best possible, this are after all on the entrance to the Baltic sea so we cant block it, or collect taxes for passage like in the good old days.
When you round Skagen on the Top of Jutland you have 2 main choices for your passage into the Baltic sea, and i recall they are called route Hotel and route Tango, one go down between Sweden and Denmark, the other one pass under the great belt bridge between Fuen and Zeeland islands.
Both bridges should allow for passage of the biggest ships around.
Its also where we told our American friends that cargo vessels with suspicious looking missile parts was leaving Russia, and later we learned with Cuba as the destination,,,,,,,,,,, you are welcome
Also we monitored the comings and goings of all Russian Baltic sea fleet for our NATO friends.
