szakib on Nostr: npub1vypq6…xaghx Using a boring machine is not really viable here, so you need ...

npub1vypq6jrs2melhg7y3ug2jn6dguqs6kzxhmtcd3a3qezelautzyvquxaghx (npub1vyp…aghx) Using a boring machine is not really viable here, so you need explosives (or hydraulic fracturing) for everything. That sounds way more expensive than e.g. Budapest, where you bore the tunnel and then add concrete rings. (Disclaimer: I do not work in construction.)

https://www.lansimetro.fi/tietoa-meista/historia/nain-rakensimme-kakkosvaiheen/rakentamisen-vaiheet/nain-tunnelit-louhittiin/#674dd697