How much would it cost to build an underground tunnel

would it cost to build an underground tunnel from one place to another, and how long would it take?

subway tunnel with automatic machine working

circular subway tunnel with automatic machine working to transferring product and parcel to final station and warehouse

The Wawona tunnel illuminated at night in Yosemite National park in California.

tunnel road along the Sora-Cassino road near Atina town in the Italian Lazio region