Questions tagged [underwater]

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

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3
votes
1answer
82 views

Could terrestrial plants emerge from seaweeds?

Is it possible that plant life (or rather, alien plant analogues) could start as seaweed in water, before evolving to become terrestrial, similarly to what happened with animals and fungi? And if so, ...
8
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5answers
169 views

Could a hippopotamus-like creature still run underwater if it was tall and slender like a horse?

Hippopotamuses are heavy, dense creatures that are capable of running underwater. However, they are quite bulky and short-legged. Could an animal have long, slim legs, like a horse or deer, while ...
7
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8answers
4k views

Could an jet engine that uses water as fuel work?

Could a jet engine that uses water work? The idea is that water is sucked in, compressed, and boiled instantly by a dozen mirror focused industrial grade lasers. The resulting super heated gases would ...
6
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2answers
122 views

Viability of underwater palace built by merfolk

In my fantasy setting there are merfolk who live deep under the ocean and neighboring human civilizations nearby based on iron age civilizations like the ancient greeks and phoenicians. I would want ...
0
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0answers
32 views

Surprising octopies [duplicate]

Let's assume that an octopus can read your mind and send you ideas that make you believe they are yours. How to surprise the octopus assuming she might not be in the mood for jokes. Consider the ...
10
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4answers
2k views

Would limbs evolve underwater?

So the premise is that life under the sea and life on the ground has evolved independently and achieved sentience. Finally, the land creatures (I'm using humans for now because of simplicity, I'm ...
5
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1answer
251 views

How effective would Rods from God be on an underwater target?

If I take a Rod from God, drop it on to an ocean somewhere, what exactly happens? Let's say there's a secret base about 10,000 feet or so underwater. Is it still okay?
13
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7answers
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How would merfolk insulate an underwater house?

If you tried to insulate your underwater home, making it water tight... wouldn't you suffocate yourself? Water does get stale, and run low on oxygen, creating a dead-zone, so wouldn't you want some ...
4
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2answers
173 views

How would mermaids protect themselves against electricity?

There are some underwater electric beasties, in the sea. And, in a fantasy world... nature is always worse. My thoughts and ponderances So, let's say the mermaids do have rubber, for simplicity. Great....
17
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6answers
2k views

What technology would mermaids excel at?

I regularly see people speaking about the difficulties of technology underwater, and see questions about whether underwater civilizations could produce fire, electricity, etc.. But I haven't seen any ...
8
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6answers
339 views

How would mermaids collect oxygen for their underwater cities?

I was thinking there might be a guest room for humans down in Atlantis. But this raises a question: how would they get enough oxygen for their guests? Mines have various techniques for oxygenating ...
3
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2answers
100 views

Expanding a free floating underwater city

Okay, I have a planet with a global ocean of liquid water, and there are these cities in the ocean, floating a few hundred to a few thousand meters beneath the waves. They have spaceports that allow ...
20
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7answers
2k views

What kind of ships would an amphibious species build?

To give a bit of background and ground the question in context: I'm concerned with the technology level from prehistory to Renaissance, or thereabouts. Analogous to Earth history, the 'normal' land-...
6
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4answers
246 views

Using pre-steam technology how can a large bore tunnel be used to drain a lake from below?

General scenario A planet similar to Earth but with only 1% of Earth’s water supports a civilization with pre-steam levels of technology that live near a river on the south side of a mountain range. ...
10
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3answers
832 views

Seeing air trapped under ice while underwater [closed]

A scene am writing takes place in Summer in the Artic. The character is swimming underwater, under the ice (imagine a small iceberg). Above her a large bubble of air has formed. Never mind what formed ...
6
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10answers
3k views

How to Salvage From a Sunken Spaceship

This was an idea loosely inspired by a Sci-fi movie that I will not name here. But the relevant part is that it involves an interstellar colony ship landing on a planet and the crew learning that the ...
1
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2answers
175 views

Identify the physiological health obstacles to humans residing in a 540 fathom deep sea colony at ambient pressure with a specific air mix?

Deep sea colonization has been dreamt of for nearly a century now but most approaches, such as the recent movie Underwater rely on maintaining the colony at 1ATM rather than circulating mixed gas at ...
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0answers
141 views

Merfolk Laws And Government [closed]

Recently, I saw this image, and later, this image, which inspired me to think about the culture of merpeople. I've got quite a lot worked out, but I'd appreciate hearing other's ideas. In particular, ...
9
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3answers
238 views

What Would a Deep-Sea Diving Humanoid Look Like

I'm wondering what adaptions would be needed for an air-breathing, land-worthy homonid to be able to do deep-sea diving of at least 3,000 feet deep and for at least one hour. What changes need to be ...
4
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2answers
133 views

How to sneakily erradicate thousands of humanoid tribes that live in the sea? [closed]

This question isn't about structuring the plot of a story. It has nothing to do with any element that isn't listed in this post. It's about what technical solutions would be best to solve a really ...
3
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3answers
141 views

How can two mermaids (one paralyzed), escape underwater prison built to capture their kind? Also, what kind of prison will that be? [closed]

The situation on which my question is based, two mermaids are imprisoned in an underwater prison unit. This city is on top of a plateau. Hence, mers mostly move horizontally like humans and often ...
2
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2answers
79 views

How Can An Alien Ship Harness Nuclear Energy? [closed]

A massive alien vessel is buried in a sandbank under the sea. Research subs detect a vast supply of nuclear energy held within it. I've been researching power plants, fission and the processes that ...
3
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1answer
84 views

A Seafloor of Ice and Rock: Ice VI / Water Boundary

Many planets out there will be water worlds. Those generally come in two flavors: either the oceans are so deep that the water turns into high-pressure ices like ice-six, -seven, -ten and -eleven or ...
3
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2answers
94 views

Navigating in a Subsurface Ocean

Based on the planet from this question. The main thing that distinguishes this planet from, say, Europa, is the handwavium light-source, which I must assume is wrapped in a perpetual explosion wrapped ...
3
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1answer
143 views

How large could sea creatures grow on a terraformed Ganymede?

If we assume a terraformed Ganymede has a global ocean roughly 800km deep, that food is bountiful, and that it has been populated by a variety of life from Earth, how large could these creatures grow ...
8
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2answers
244 views

How would underwater weaponry and technology look under high pressure?

Suppose we have a fictional water planet. Humans have discovered interstellar travel and have colonized the planet. They live in large underwater cities. Its oceans are under high pressure, say ...
3
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2answers
101 views

What are resources that would help realize an underwater world?

Like how mermaids would experience and perceive life underwater. Want something grittier then the inconsequential, and uninspired in my opinion, way the Aquaman movie portrayed an entirely underwater ...
17
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9answers
3k views

A drinks party underwater?

Landia, a land based civilisation, has recently established diplomatic relations with Aquatica, a civilisation of fish people. The two peoples exchange gifts to each other - including from Landia, a ...
4
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3answers
207 views

Why would an 'ampihibious' race of underwater isopods choose to keep their focus underwater when the land provides a great new bounty?

Basically, in my fantasy world there is an 'amphibious' race of anthropomorphic isopods known for their underwater lifestyles, scattered land settlements, shoe raiding parties and the lead cause of ...
9
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4answers
253 views

What environmental factors would cause bipedalism underwater?

While reading this question about how non-primate mammals could develop a bipedal stance, I became curious about the broader reasons why animals could evolve to walk on two legs. I found some ...
5
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9answers
3k views

Primitive underwater melee combat [duplicate]

My setting contains modified humans who live on an ocean planet with only small pockets of land. Generally, large populations of people live on these small islands but since land is so restricted, ...
6
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5answers
273 views

Fast way of Avoiding the Bends

OK, still in my Victorian Steampunk Shadowrun setting, we've got some underwater cities (care of a certain Prince Dakkar). They're on average 50m below sea level, with a couple being deeper at 150-...
4
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2answers
187 views

How can primitive human species create an underwater civilization and adapt to their marine environment?

Hopefully this isn't two separate questions - I do feel like they are interconnected enough that they can be counted as one. I'm wondering if it would be possible for primitive human ancestors. Let's ...
27
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6answers
5k views

How would an underwater race protect against pressure waves?

In my fictional world, there is a race of mermaid-like creatures that are having a bit of a problem. That problem is that the surface dwellers have made something called a depth charge. This makes ...
6
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2answers
229 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 ...
9
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7answers
241 views

What reason would a hidden, deep ocean society have to come up to the surface of a post-apocalyptic Earth and claim the land for themselves?

This is strictly Earth based. Would it be possible for a society to develop their own civilization underwater (nothing fantastical like Aquaman or whatever, but more of a grimy, hardscrabble existence ...
2
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4answers
419 views

Could a mature (and giant) lobster remain in sea water indefinitely without decaying?

My pantheon of storyline gods includes a "titan" of sorts, in the form of a giant lobster. At one point in time, she returns to the coastal ocean and exists in a meditative state on the seafloor for ...
11
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4answers
950 views

Fishing from underwater domes

It makes sense to me that the best food in an underwater dome complex would be fish. Considering the massive amounts of aquatic life in the vicinity, it could work pretty well. However, I can't think ...
7
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3answers
1k views

Bronze Age Underwater Civilization

I was thinking of an alternate history, in a part of a civilization, living along the Eastern Mediterranean, during the Bronze Age moves to the sea floor to found an underwater civilization. They ...
3
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4answers
230 views

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

I'm interested in creating a society in the Twilight and Midnight zones of the ocean. By what means could they mine, farm, and trade in what is supposed to be a more futuristic society?
-1
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1answer
132 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 ...
9
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3answers
598 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
217 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
108 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
174 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 ...
0
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4answers
227 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 ...
7
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5answers
867 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
348 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 ...