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So you want to build a tunnel

https://practical.engineering/blog/2026/2/17/so-you-want-to-build-a-tunnel
42•crescit_eundo•1h ago

Comments

poszlem•1h ago
When my wife was diagnosed with cancer and eventually went into remission, I didn’t really process what was happening at first. I was completely focused on getting her through it. The grief hit me later.

What helped me more than anything was going out into the garden and digging. I made sure to do it safely, since I know it can be risky, so I dug wide and with wooden supports, but there was something about just digging and digging down that let me work through all the darkness that had built up in my head. It gave those feelings somewhere to go.

This is unrelated, but I wonder if I did actually hit on something primal in myself.

devmor•42m ago
I think the “primal urge” to dig is just really seeking the endorphins of manual labor. Digging like that is especially attractive because there’s little planning (unless you’re making a tunnel like the subject here) and no material investment but the earth beneath your feet.
tasty_freeze•36m ago
One of my sisters had four boys (and no girls) and during summers they would drive her crazy with their boredom. When they were about ages 8-14 one summer she said: go in the back yard and see how big of a hole you can dig.

Wide-eyed they said: really? She said yes, dig as much as you want, but the only rule is it all gets filled in before school starts in the fall. 30 years later they say it was the best summer ever. Every day they were working on it and all of their friends would come by and help dig and plan what development would come next.

rtkwe•32m ago
How deep did they get? Hope she kept an eye on it unsupported holes quickly get dangerous, people underestimate how much weight is in the soil if the sides give out and just how dangerous that amount of weight moving can be.
autoexec•13m ago
You can get the same endorphins with exercise, but you don't get to see the results of your work. It's so much more satisfying when you can clearly see your progress. Playing in sandboxes or digging holes in your yard is a game, but manual labor alone is often just work.
downut•30m ago
I figure if Seymore Cray thought digging was useful for mental hygiene it's probably ok:

https://en.wikipedia.org/wiki/Hobby_tunneling

greggsy•1h ago
Article really needs some sub headings or images - just anything to help situate where you are in case you navigate away from where you were reading.
gwbas1c•1h ago
The article is a transcript of the video at the top of the page.

Grady's videos are quite impressive to watch.

MisterTea•58m ago
There are people like myself who prefer to read at our own pace, even skim the article and look at pictures. Video sucks.
hparadiz•48m ago
Okay but that's not what this is. It's a YouTube channel. A very well known one in fact.
dilawar•44m ago
I prefer text too but this channel is just amazing..
kleiba•1h ago
Colin Furze ftw!
pstuart•1h ago
Brings to mind this woman's efforts -- very impressive indeed:

https://www.youtube.com/@engineerkala/

Edit: reading is hard -- I only skimmed and did not realize she was mentioned.

advisedwang•17m ago
He explicitly mentions her in the video.
pstuart•10m ago
My bad, I just skimmed. This is HN after all ;-)
gostsamo•59m ago
Completely offtopic, but my first reaction was this song.

Enjoy for those who would enjoy such things: https://www.youtube.com/watch?v=34CZjsEI1yU

cucumber3732842•41m ago
This article/video really rubs me the wrong way. These strawmen who are being torn down for the most part aren't building "tunnels". They're building glorified 8-10ft foundations and basements with dirt over the top instead of structures, 1970s hippie "underground homes" basically. They're calling them tunnels and bunkers for clicks and views.

To then take that naming at face value and pontificate about code and engineering is very much a two slights of hand not making a right situation. Furthermore, a civil engineer doing so is deep into "man won't understand what his salary depends on him not understanding" territory.

I know that the many HNers from the seismically active portions of the US will have no frame of reference for this but there are portions of the world where for hundreds, sometimes thousands, of years basements were built with less than scant engineering. The sort of "just barely below dirt" construction most of these amateurs are engaging in is on that order of complexity. Based on my observations via Youtube, these amateurs should be more scared of their own temporary construction rigging and material handling solutions than the forces their structures must hold back.

The primary practical engineering challenge and hazard these structures face is that there's nothing stopping someone from driving a point load of undefined size over the top and that has serious implications for roof strength.

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