I’m not sure what part of the world you’re from. But if you’re American it’s good to note that tunnels in the EU cost about 50% of their equivalents (i.e. simil

I’m not sure what part of the world you’re from. But if you’re American it’s good to note that tunnels in the EU cost about 50% of their equivalents (i.e. similar purpose and geological conditions) in the US. [1] It’s not totally clear why this is the case. But for some reason building infrastructure in the US is substantially more expensive than anywhere else in the world. Even when controlling for the quality of that infrastructure. So if you are American, then your intuitive costs for these tunnels might be way off their actual cost. [1] https://tunnelingonline.com/why-tunnels-in-the-us-cost-much-more-than-anywhere-else-in-the-world/ https://tunnelingonline.com/why-tunnels-in-the-us-cost-much-...