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Questions tagged [underwater]

For questions about events occurring below the surface of a body of water.

3
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4answers
158 views

What plant life and resources could humans consume if colonies were established on the ocean floor?

I'm interested in creating some construct of a society in the Twilight and Midnight zones of the ocean. By what means could they mine, farm, and trade in what is suppose to be a more futuristic ...
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1answer
97 views

World underwater: technical viability

I want to put a story in place where a country lived underwater, and I am wondering of its viability. Here is the world description: It is a square of 100 km*100 km on the ocean with the weather and ...
21
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10answers
4k views

Looking for a soft substance that doesn't dissolve underwater

I'm writing a story that takes place entirely underwater, mostly in a deep sea town and shallower city. Both are underwater and populated by beings who can survive underwater. My thinking is that ...
8
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3answers
438 views

Underwater city sanitation

In a vaguely Medieval setting with some limited magic, how would an underwater city handle sewage? Sanitation was one of the biggest limiting factors in the growth of human cities, and being under ...
3
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2answers
145 views

Would an deep sea lava river be feasible?

I don't wanna reveal too much about my world, however, the basic idea is that there is a town of people who live deep underwater (they are biologically capable of doing underwater gas exchange and ...
-1
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2answers
93 views

Underwater City- Applications of Nanotech

With the rise of global warming and our leaders not seeming to do enough about it, expanding our ranges past the earth's ground seems like something we must do eventually. Everyone always points to ...
6
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3answers
1k views

Submarine propulsion using evaporation

In a post-post-apocalyptic world with adequately schizophrenic tech, a tinkerer decides to build a submarine engine around a lump of radium, or some other reliable source of heat. But instead of using ...
9
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2answers
162 views

How to blow up water and fly through the wake

I want to achieve the following. Jet + secret base underwater + blow up water with bomb to gain entry to tunnel at bottom of the sea, see image: Say that the depth is 1000m, then Based on calculation ...
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4answers
183 views

Could a future, science-fiction submarine navigate almost vertical and/or turn upside down?

I have followed this forum for quite some time. Now is the time to ask my first question :) I'm currently working on a story in which a future, civilian luxury submarine is used to research some ...
5
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4answers
169 views

What materials would I use to build an underwater city?

I'm currently trying to set up an underwater race in my world—merpeople if you will—and I'm trying to figure out how their city would look. I'm basing their religion and lifestyle on native ...
4
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4answers
289 views

What would happen to a human dragged quickly from the surface to the mesopelagic zone?

My mermaids have returned, and now they're dragging semi-conscious people about 700-ish meters underwater. Is it realistic for the person to still be alive at this point? (Y'know, for about ten ...
11
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8answers
306 views

How might a highly intelligent aquatic species (mermaids) communicate underwater?

I'm trying to create basically realistic mermaids, and working on developing body language and vocalizations. I have most of the vocalizations I can think of (suggestions are still appreciated), but ...
8
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6answers
270 views

How can merfolks stream video in a way much similar to our WiFi but underwater?

Right now merfolks are totally envious of us watching a live stream video of cat(fight) via WiFi or satellite internet, ok ok I get it's not the speed but its latency... Urrrr. Nevermind that I ...
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8answers
10k views

Is it harder for an intelligent octopus to live on land, or a human to live in space?

I have a race of octopodes with the same intelligence distribution as humans. I want them to “colonise” land to a similar extent as we have “colonised” space; have regular transport between the ocean ...
3
votes
2answers
189 views

What are the architectural considerations when an underwater species builds a city?

I've got a species that lives in the Southern Ocean along the Antarctic coast, and they are basically a sentient crossbreed of Orca whales and elephant seals. They are omnivores, have opposeable ...
7
votes
3answers
180 views

Plausible futuristic infrastructure for an underwater micronation built 300-500 feet below the surface

My story takes place hundreds of years in the future after global warming has made life at the surface uninhabitable for most life forms. What’s left of mankind survived because it became popular to ...
24
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8answers
9k views

What would happen to a human body subjected to extreme water pressure?

First of all, I tried to look if this wasn't answered before. Found this and this but neither is exactly what I need. Some Context There's this race of humanoid fish people. They live in cities ...
2
votes
2answers
238 views

Can my mermaids work?

Looking to how I can make Nagas and Mermaids able to exist and evolve in my story, I came across this post which explains how Nagas could evolve from humans: Anatomically Correct Naga In the top ...
3
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1answer
170 views

Underwater Farming

In my colonizing business, some colonists build a underwater base on a all-about nice planet. They are using food storage right now; but now they need to start farming. Ive looked up some farming ...
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3answers
155 views

Giant Terraforming [closed]

In my story, a planet colonizing business goes to a very unlikely part of space to have a good planet in the goldilocks zone. When they out of pure luck, scan a planet almost exactly like earth. They ...
4
votes
2answers
230 views

What Sea Creatures Would Make Good Undersea Cavalry?

In my book series, there is an underwater civilization called the Lobster Empire (basically underwater Rome inhabited by Crab and Lobster people). Stuff to know about the Lobster Empire: Roman-esque ...
1
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2answers
123 views

How would a colossal explosion affect an ocean-based planet?

In my book series, a space station called the T-Ray that is capable of causing explosions the size of the Chixculub impact explosion just fired at a planet that is completely covered by a massive ...
1
vote
1answer
82 views

Submerging to avoid storm damage [duplicate]

The land is full, there are no roads, and cars can fly. Some spend their whole lives in a single square mile. Life isn't entirely miserable for the average person, but trust me. You wouldn't choose ...
7
votes
8answers
528 views

High tech underwater weapon

Assume soldiers of the future need to fight person to person underwater, at depths from 30 to unachievable today, like 1-2 kilometer. Today, underwater warfare between scuba divers, involves ...
9
votes
4answers
2k views

In a single-continent world, what could cause hydrothermal vents?

In the world I'm building, there is a single continent. However, in the deeper parts of the ocean, there are hydrothermal vents. They're pretty necessary to my story, but I can't figure out why they ...
5
votes
3answers
214 views

How large does a human’s plastron need to be?

I’m referring to an entomological plastron which is a structure that traps a bubble of air next to the insect's body but permits contact between the air and the water. As the insect consumes oxygen ...
5
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5answers
295 views

The practicality and feasibility of a fully-submersible aircraft carrier

There's this organisation with an underwater naval base on Île Pott masquerading as a third rate hotel resort. Said base features several underwater hangars housing a considerable fleet comprised of ...
3
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2answers
169 views

What phonemes are most recognizable underwater?

In my fantasy world, there has been a longstanding presence of underwater civilizations, both alongside and independent of surface-based kingdoms. In the style of Tolkien's Beleriand, various ...
0
votes
1answer
153 views

How can a planet have an atmosphere in a universe full of water? [closed]

Imagine a universe where the space is not empty (or almost empty) but somehow it's full of water or other liquid. How could planets still have an inhabitable atmosphere? What could make this "air ...
8
votes
3answers
388 views

Could mermaids feasibly make clothing out of natural rubber?

In a world I'm currently developing, I'm working on a merpeople equivalent (more or less physically identical to your bogstandard mermaids, for the purposes of this question), and I want them to wear ...
23
votes
12answers
10k views

Could a person scuba diving take off his air tank and use it to propel himself?

So, in my story, in a prelude to an epic aquatic fight scene, my main character gets chased by a great white shark. He swims as fast as he can but he can’t escape. Just to clarify, he’s wearing one of ...
15
votes
4answers
3k views

Could you actually make Sandy's Treedome in real life?

So, I have a question that focuses on a character from a show, Spongebob. Sandy Cheeks lives in a reverse aquarium under the sea in Bikini Bottom, in a dome that looks like this The Treedome is made ...
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5answers
673 views

Would the collapse of civilization make turning into a vampire and colonizing the ocean floor a sane idea?

One idea I've always wanted to try writing is the concept of vampires exploiting their lack of a need to breathe and generally low-maintenance biology to escape the brunt of the sun's rays by living ...
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4answers
216 views

Getting through the ice, to the ocean of Europa [closed]

Trying to figure out the practicalities of drilling through the ice on Europa's surface, to drop a sub into the water beneath. From what I understand the three most viable methods would be Wait for ...
1
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1answer
83 views

Foundation For An Underwater Dome [closed]

Can I get help on how to make a foundation for an underwater dome that can hold an amount of 150,000 people? But don't try to use Wikipedia, please.
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15answers
5k views

Are there any structural materials suitable for production underwater?

One of the points made in a number of recent questions regarding underwater races has prompted me to review one of my older pieces of world-building. Namely: the difficulty of producing common ...
4
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0answers
205 views

What is a realistic look for a humanoid race that can live in deep-water and land? [closed]

So I have an original species that I'm creating called the Larimar. I have a picture of them below, which I drew. I'm still working on the backstory for these folks, and I don't want to give away too ...
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1answer
62 views

What to have in a future colony [closed]

can I get help on finding out what the price of many items would be in a colony in the future or in 3000? I also need to know what kind of ways we could use a colony underwater. Someone please help ...
4
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6answers
355 views

Weapon that can destroy an underwater city?

Two intergalactic superpowers, the Western Republic and the Eastern Empire, are in a Cold War. The Eastern Empire is comprised of mostly aquatic species, while the Western Republic is mostly ...
3
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5answers
432 views

Forging metal under water, using thermite

I have a world setting that contains a variety of underwater species, some crustacean, some cephalopodic, and other varieties. Different species are adapted to different depths, and a few are ...
6
votes
2answers
355 views

What would the “tanks” of an underwater race look like?

Note: Some answers will refer to not just tanks, as previously I asked about military vehicles in general, then edited it because it was too broad. So, right now I'm working on a project centred ...
6
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3answers
167 views

Deep Sea Habitat on a Low Gravity Planet

I read somewhere that the lowest depth for a sustainable underwater habitat is estimated to be three-hundred meters. Any lower and the pressure becomes too great for structures that are currently ...
2
votes
1answer
157 views

How would an aquatic, air-breathing species develop the technology to create a spaceship? [closed]

This question is about attaining the technology required to build a spaceship. The asserted duplicate question assumes that technology already exists. In order to build a spaceship, you need to: ...
7
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6answers
293 views

How would an aquatic, air-breathing species organise its spaceship interior?

It's easy to imagine how would a water-breathing aquatic race outfit its spaceship - take a normal spaceship, insulate it, fill it with oxygenated water, possibly add some enhanced turbines to pump ...
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3answers
261 views

If a species of dolphins were developed with a few tentacles, what type of society would they build? [closed]

One of the most special things about humans compared to other animals is our industriousness. We have intelligence and we are able to make use of it. I was wondering if Dolphins, widely considered to ...
16
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9answers
3k views

What underwater creature would be well-suited as a pack animal?

Suppose that there was a tribe of nomadic mermaids whose lives were primarily centered around following pods of dolphins to eat. They live in the equivalent of the frigid antarctic seas. As they ...
6
votes
3answers
326 views

Could modern sharks adapt to live in deep water?

After circumstances make the shallow water in the oceans uninhabitable, great white sharks retreat to the deeper parts of the ocean, about 600 feet down (182 meters) to survive. The sharks can not go ...
2
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2answers
311 views

How long could a city last if it were completely underwater?

Let's say there is a city, about the size of New York City, that is made only out of stone, steel, and glass. This city would be completely underwater. Assuming no humans are alive in this city, how ...
3
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4answers
357 views

What weapon would be used by a civilization living 10 000m underwater?

I am creating a population of human fish that has created a city in an oceanic trench. There are few things to know about this kind of people and the place where they live: they are a bit stronger ...
5
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5answers
1k views

Where on Earth is best to build a large underwater lab complex?

Let's say I'm an extremely rich and somewhat secretive research group who wants to carry out experiments and such away from the prying eyes of the public. One of the obvious ideas for the location of ...