Almost every tunnel has a lining that makes widening prohibitive. Which is why t... | Hacker News

Hacker Newsnew | past | comments | ask | show | jobs | submit

		NeedMoreTea on May 29, 2019 \| parent \| context \| favorite \| on: The Boring Company will develop an underground “pe... Almost every tunnel has a lining that makes widening prohibitive. Which is why the London Underground is forever stuck with small tunnels on the original lines.

Retric on May 30, 2019 [–]

A larger issue is the underground is in use forcing you to do something like: www.rocksoil.com/pdf/233_r.pdf

That and the cost vs benefit is not considered worth it.

Guidelines | FAQ | Lists | API | Security | Legal | Apply to YC | Contact