Underground Cities

It's pretty expensive.

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>>8641220

Difficult and often costly, very hard to get good airflow, ground water becomes polluted, smoke from all the lights you need is very hard on the lungs, also apparently very noisy.

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>>8641235

Looks cozy with bright electric lighting, but imagine having to live in this with nothing but candles and torches for lighting?

It takes less effort to stack up some rocks or wood than it takes to dig out a stable tunnel.

Also, you can make a wooden shack anyplace on Earth that isn't covered in water, but there are only very few specific places where you can make a tunnel that won't collapse quickly

>>8641220
Expensive to dig holes. People want sunlight.

There is one in canada
https://en.m.wikipedia.org/wiki/Underground_City,_Montreal

because your mom touches you at night

>>8641220
You have to ask yourself what the advantages to have an underground city are, and quite frankly they're not that great. As a matter of fact, having an underground city would appear more costly due to the technological health demands that arise from having sufficient oxygen and sunlight. Not to mention that most people would have issues with the aesthetics of living most of their time in such a strange, inhuman like habitat.

>>8641266
Montrealer here.

Not nearly as impressive as it sounds.

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>>8641220

We have. Examples include:

- Cheyenne Mountain Complex (NORAD headquarters)
- Raven Rock Mountain Complex (Pentagon backup headquarters)
- Mount Weather Emergency Operations Center (FEMA backup headquarters)
- Project Greek Island/Greenbrier Hotel (backup US Capitol)

and likely many more. Much larger mass shelters (intended for regular people) were studied but ultimately cost too much money to implement:

http://atomic-skies.blogspot.com/2013/09/rock-to-hide-me.html

http://atomic-skies.blogspot.com/2015/08/under-cover-schoharie-valley-townsite.html

http://atomic-skies.blogspot.com/2013/07/the-abo-school.html

The problem is that nobody wants to live in such a controlled environment. More importantly, the cost of construction is massive as is the cost of ventilation, underground facilities lack any sort natural means of waste heat removal (unlike above ground structures).

>>8641264

>but there are only very few specific places where you can make a tunnel that won't collapse quickly

This is wrong, if you go deep enough there's plenty of stable bedrock to make tunnels in. But it's not economical.

What branch of engineering is involved with underground structures? Is it Civil Engineering?

>>8641235
Most places also don't have the relatively soft stone that Cappadocia has which makes it easier to dig out.

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What did he mean by this?

>>8641458
It's billionaire slang for gangbanging your mom.

Well we are about to find out thanks to daddy Elon's new tunnel boring interests aren't we? We need to go 3D up or down bitches

>>8641458
He's fucking around with tunnels at the SpaceX campus in an attempt to find a way to make tunneling 500-1000 times more efficient.

He also stated that they don't know what they're doing, but they're going to learn as they go. I'm guessing it's just a side-project for some of the autistic engineers at SpaceX. Instead of just going to the game room during their break like everyone else, they'll spend their break coming up with a tunnel-boring machine.