Interesting -- expected this to be about the Fehmarn Belt Fixed Link¹, as there are already various tunnels through the Alps... 1) https://en.wikipedia.org/wik

Interesting -- expected this to be about the Fehmarn Belt Fixed Link¹, as there are already various tunnels through the Alps... 1) https://en.wikipedia.org/wiki/Fehmarn_Belt_Fixed_Link https://en.wikipedia.org/wiki/Fehmarn_Belt_Fixed_Link