Tunnels
- Wikipedia on large tunnel-boring machines - [1]
- Virgin is also into alt transport with underground Hyperloops [2]
- Cost - Boring Company is predicting $5M/mile [3] and a mile per week boring distance. [https://www.nextbigfuture.com/2021/08/boring-tunneling-cost-predicted-to-be-4-5-million-per-mile.html
- There is huge red tape for building tunnels, and costs are $100M-$1B per mile [4]. The Boring Company was supposed to do $10M/mile
- Boring machines - called moles - cost a million. They work like this [5]
- In soft rock Youtube - digging for gold [6]
- Rock bolts are used to stabilize a tunnel - [7]
This is how subway tunnels are made; the future of transportation pic.twitter.com/H26YxUe1Fq
— Vala Afshar (@ValaAfshar) September 11, 2022
