Questions tagged [underground]

For questions dealing with things that happen beneath the surface of the planet or other celestial body, except for things that happen in water (use [underwater] for that).

Filter by
Sorted by
Tagged with
8
votes
8answers
2k views

Algorithm or tool to design a worldwide subway transit map?

As the question says, an impossible (not earth) futuristic world has a subway system spanning across the entire planet and I would like to design its transit map. The obvious problem with doing this ...
2
votes
1answer
241 views

How deep underground could we truly go

At a point of overpopulation in the future say 2045 and given what resources the world has at it's disposal and all manpower possible, what extreme depths could we dig down into the earth to create ...
1
vote
2answers
191 views

Can this underground culture survive for 200 years

I have a underground culture that has been cut off from the surface for near on 200 years, and I am trying to understand what issues will I need to cover and am most likely to run into for there ...
5
votes
3answers
125 views

How advanced could an underground society get?

To briefly summarize: former slaves to a race of flying dragon-like humanoids (I've made some modifications to them based on feedback, but the gist is more or less the same) have escaped into the ...
4
votes
2answers
151 views

Air Pressure in a Purely Underground Setting

I'm working on a completely flat, underground world, where "world" means "universe" rather than the equivalent of "planet". Here's what I have so far: The world is a flat, apparently infinite (in two ...
8
votes
1answer
95 views

Geothermal gradients if Earth becomes a rogue planet?

Assume Earth has been wrenched out of the Sun's orbit and has become a rogue planet, with its surface equilibrium temperature falling to ~-240C. At what depth will temperatures remain "comfortable" ...
2
votes
3answers
130 views

Realistic look for subterranean humanoid race

So i have been playing around with the idea of a world that due to its orbit (it is both quite a bit away from it's parent star and due to its orbit permanently between two much bigger planets) has ...
6
votes
2answers
181 views

How to safely construct deep underground harbors on a Snowball Earth?

A radical shift in the Earth's orbit has made the Earth much colder, with all the oceans freezing over, and the atmosphere liquifying and falling as rain. Humans live deep underground in areas of high ...
3
votes
2answers
91 views

What are possible ways of underground humanoids developing eyes?

I'm thinking about underground humanoid cvilisation without knowledge about outside world and how could they have eyes? Known fact is that a lot of animal living in dark don't need eyes. (cave or ...
5
votes
2answers
289 views

How long can 400 people survive in an underground facility if they had to seal off their heat vents?

Assume the surface of the planet is experiencing ice age conditions and the facility was designed to keep the occupants alive for 6 months. An emergency forces the permanent closure of all Heating, ...
1
vote
3answers
228 views

Underground Base

If I had a huge underground bunker powered by generators and the generators failed, would it be warm enough underground to keep people alive? How deep would it have to be for people to be comfortable ...
4
votes
2answers
160 views

Realistic nuclear land mine in megaton range

Situation: there is an are of likely attack, something in line of Fulda Gap which looks indefensible in case of serious war, so classical approach would be just a barrage of tactical nukes the value ...
10
votes
5answers
232 views

Art and Fashion for Nocturnal/Underground Species

I've been thinking of a story revolving around a smallish humanoid troll/lemur-like species with large eyes, a tail, and bat like ears that allows them to use echolocation. They typically prefer low ...
1
vote
5answers
174 views

How would Elves survive underground without prior experience? [duplicate]

Background: An Elven nation that once thrived for thousands of years as a predominantly agricultural race was forced underground because of unexplainable occurrences of extreme weather conditions (...
6
votes
3answers
503 views

What would the physical effects be to Elves if they began living underground?

Background: An Elven nation that once thrived for thousands of years as a predominantly agricultural race was forced underground because of unexplainable occurrences of extreme weather conditions (...
11
votes
6answers
1k views

How would 10 generations of living underground change the human body?

In my country, we are split down the center by an intensely large mountain range. Us desert people live on the eastern half of the country, while on the other side of the mountain range the forest ...
0
votes
1answer
215 views

Do abandoned sewers and underground tunnels really exist like portrayed in movies? [closed]

In movies there are man-size tunnels where criminals or main characters are hiding or living. Do such tunnels exist in real life and, if so, why are they not controlled. Why is there still power on?
0
votes
3answers
423 views

How long can a human stand to be underground?

How long can a man survive underground without going insane? A traveler is buried under stones in a cave system. His only sources of food are mushrooms and creatures that live in the caves. Some of ...
1
vote
2answers
185 views

Are 4 arms better than 2 underground? [closed]

Are creatures with 4 arms viable underground? Creatures have to be able to climb and eventually dig! Those creatures are not intelligent. They hunt and feed on dwarfs. They were nearly extinct (100 ...
8
votes
2answers
224 views

Would Small Mecha be well-suited for Underground Warfare?

Assume a subterranean civilization exists with technology roughly on par with the modern era. With changes due to lack of certain environmental factors being likely due to the vastly different ...
5
votes
2answers
2k views

What are the best weapons and armour for fighting underground? [closed]

Assuming a human society possessing technology on par with the High Medieval Age, circa 1100 AD. The humans have adapted to living underground after ~3000 yrs. Their skin has less melanin, making ...
0
votes
4answers
218 views

How would an underground society have wars? [closed]

Two underground dwarven races are fighting a war. Dwarfs usually live in mines, but they can also move on surface. One army of dwarfs also control giants. The upper ground terrain is made of mountains ...
11
votes
4answers
484 views

Could dwarves do without wood?

Wood has, historically, been used, and still is, to make a great variety of things. Indeed, this material has many qualities, the most relevant being: Commonplace: in most places in your typical ...
2
votes
1answer
88 views

How might clouds be produced in a large underground fantasy realm?

I'm attempting to give my fantasy world weather/clouds, (some might be light-producing to add to other light sources, so if there's a scientific way to do that, please give it to me). There are ...
3
votes
5answers
295 views

How to create a sunny atmosphere without an actual sun?

I have a large underground fantasy world which is only accessible through the Mariana Trench. I'd like to do a day/night cycle and have have a bright, sunny atmosphere part of the time, but I'm not ...
3
votes
4answers
192 views

Underground Atmosphere

I have a terrestrial planet that is similar to Mars in many ways, a desert-like surface, thin atmosphere, and inhospitable to large flora and fauna as we know it. This planet has ceased tectonic ...
8
votes
1answer
961 views

Can fiber optic cables be used to pipe sunlight into an underground bunker for growing plants?

One major problem with living underground is you lose all of that wonderful energy provided by the sun. This energy is useful for many things including growing plants for food. A window is effectively ...
7
votes
4answers
386 views

How is infra-vision any good?

Supposing a world like the Underdark, full of civilizations that developed and live their lives completely away from the light of the sun. In the typical D&D type setting, these creatures have ...
21
votes
15answers
7k views

How do dwarves defend their City-under-the-Mountain from a dragon?

The Kingdom of the Dwarves has been rich and prosperous since the days that the first Dwarf-father awoke in the roots of the mountain. In the uncounted ages since he rose, the depths of the mountain ...
2
votes
1answer
77 views

Anaerobic Fungal or Plant life

The Dark Warlock Susie has heard of a cave system with a lethal density of argon that is protecting a burgeoning monster population. In the interest of beefing up her security, Susie wants to recreate ...
11
votes
5answers
477 views

What would a medieval war against a subterranean race look like?

To round off the little series started by this and this, I figured that I should add this question. The setting: there is a race of underground people living beneath a human kingdom. To avoid the ...
7
votes
8answers
1k views

How would an underground city-kingdom re-capture its surface land?

My kingdom has 2 entrances in a hilly field by the ocean shore, comprising over 100 acres. The entrances are the size of a road and can carry carts up and down tunnels leading 12 stories underground ...
3
votes
3answers
310 views

What Foods are Possible for an Underground Society

I'm writing the story for a game I'm making. I've got an underground farm powered by artificial lights. I was wondering which crops would be best as a food source and for efficiency. I've done my own ...
2
votes
3answers
289 views

How would an underground civilization that mines deal with mine tailings?

This is based on the Silo by Hugh Howey. I don't have any spoilers here though. In that book (actually a collection of 5 novels), the characters live in an underground city, and some of them mine for ...
12
votes
3answers
286 views

Where would a dense population of human beings live underground?

By that, I don’t mean what type of structures, I mean under which part of the Earth? It's an extremely densely populated nation. As densely populated as many major cities - think Hong Kong and more ...
28
votes
9answers
5k views

Biologically sound reason why underground dwelling Drow have dark skin? [duplicate]

The Drow from Dungeons and Dragons are a race of elves with dark skin and pale hair that live mainly underground. How could these elves develop such a coloration when they live underground, away from ...
3
votes
2answers
204 views

Average Speed when Caving

I have some underground travel (walking/climbing) by humans that I need to calculate time for, so I am looking for some "baseline" to go by. As such, I'm trying to figure out the average speed of ...
0
votes
3answers
191 views

Approximately how long would it take to walk up four hundred feet of stairs? [closed]

Imagine a very deep mine. You have to carry a whole lot of precious ore (say thirty pounds worth) on your back. You don't have enough energy to run, and the high heat underground is getting to you. ...
7
votes
1answer
269 views

Climate of an underground world

I am creating a board game that requires an underground cavern world, with huge pipes that pump air for the civilization living there. The underground region is at about 35-40 degrees north latitude. ...
6
votes
7answers
1k views

Would any long-range communication exist if all buildings were destroyed?

In a hypothetical situation where ALL man-made structures on earth are destroyed (including servers, cell towers, radio antennas, etc.) but anything existing underground or in space (satellites) would ...
53
votes
12answers
10k views

How can Dwarves produce honey underground?

I have often heard/read/watched in fantasy about dwarves drinking mead and lots of it. I recently learned that mead is made from honey which requires bees and flowers which require sunlight. I doubt ...
3
votes
4answers
1k views

How much time would you have to build cities underground after a gamma ray burst?

So the situation, for those who aren’t familiar, is that Earth is in trouble. Again. A gamma ray burst from a dying star somewhere close by (a couple hundred to a couple thousand ly) has grazed or ...
1
vote
7answers
553 views

How can an ultra-deep hole or canyon form naturally on an earth like world? [duplicate]

How can an ultra-deep hole or canyon form naturally on an earth like world? By ultra-deep I’m thinking something like the Marianas Trench but on land and not filled with water. If it’s not possible ...
4
votes
4answers
347 views

An underground city beneath another city?

How plausible would it be to build an entire underground city beneath another city? Would it be structurally sound? And I do mean an entire city, underground with skyscrapers holding up the ceiling.
9
votes
3answers
443 views

How thick should the roof of a large cave be to safely build a city on top of it?

Fullmetal Alchemist (2003) features a giant (and I mean stupidly big) cave under a large and busy metropolis. Nobody is aware of its existence, which means that at least since the city's founding (let'...
14
votes
9answers
6k views

How could a planet have zero surface caves?

What could cause a planet to naturally have zero caverns with surface openings apart from small impact hollows in the sides of craters and crevices carved in cliffs? To be specific, zero large ...
6
votes
3answers
2k views

How to live underground for 1000 years?

How could humans survive underground for centuries? People have built multiple underground facilities around the world to prepare for a catastrophe. Just to be careful they overcalculated their ...
5
votes
2answers
282 views

Creating a low gravity environment deep underground [duplicate]

I am creating an earth like planet with similar gravity and size and a new material has been created that can withstand the extreme temperatures and pressures of the earth's core! (Some hand waving on ...
1
vote
7answers
408 views

How could an organization steal a dragon egg out from under its mother's nose?

In my world, dragons must faithfully guard their nest during the entirety of the eggs' incubation period (ie. no food/smoke/potty breaks). The reason for this is because the eggs must be kept warm ...
1
vote
3answers
111 views

How could an airborne disease only survive undeground?

The orcs in my world are humans who have been infected by two different diseases: An airborne mutagen that permanently denatures their myostatin receptors, which prevents their muscles from being ...