this post was submitted on 04 Jan 2026
472 points (96.5% liked)
memes
18786 readers
1750 users here now
Community rules
1. Be civil
No trolling, bigotry or other insulting / annoying behaviour
2. No politics
This is non-politics community. For political memes please go to !politicalmemes@lemmy.world
3. No recent reposts
Check for reposts when posting a meme, you can only repost after 1 month
4. No bots
No bots without the express approval of the mods or the admins
5. No Spam/Ads/AI Slop
No advertisements or spam. This is an instance rule and the only way to live. We also consider AI slop to be spam in this community and is subject to removal.
A collection of some classic Lemmy memes for your enjoyment
Sister communities
- !tenforward@lemmy.world : Star Trek memes, chat and shitposts
- !lemmyshitpost@lemmy.world : Lemmy Shitposts, anything and everything goes.
- !linuxmemes@lemmy.world : Linux themed memes
- !comicstrips@lemmy.world : for those who love comic stories.
founded 2 years ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
It's actually really fucking cool, for ones like this they cast them in concrete sections, seal the ends, float them out, and sink them into place! Practical engineering made a video about
My dad's a retired civil engineer and I got to see how all this worked when he did one back in the day. I got to see the individual sections being built and then got to walk through the tunnel after the sections had been connected and before they were ready for traffic.
This one?
https://www.youtube.com/watch?v=KclYKAnaJ_k
I didn't know about this tunnel, but I imagine other ones are built by actually digging under ground right?
Different strategies for different situations!