Funny that they had to freeze the ground to dig it, as it is one of the hottest ... | Hacker News

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

		llsf 7 months ago \| parent \| context \| favorite \| on: The Evolution of Tunnel Boring Machines (2023) Funny that they had to freeze the ground to dig it, as it is one of the hottest line in Paris (at least 20 years ago).

s1artibartfast 7 months ago [–]

My understanding is that the freezing is normally about stopping water intrusion long enough to drill and place concrete

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