Questions tagged [underwater]

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

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5
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2answers
122 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
109 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 ...
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4answers
704 views

How would merfolk store and preserve their food?

I've been reading this question about agriculture for merfolk and more specifically the accepted answer. They mention the problem of food preservation only minutely. Now I'd like to pour that thought ...
3
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2answers
70 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
67 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 ...
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2answers
2k views

Creating a realistic world map - Underwater geography

This Query is part of the Worldbuilding Resources Article. Creating a realistic world map - Erosion covered the various factors that govern the topography of a world. Rivers, wind, heat, and plants ...
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4answers
220 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?
9
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4answers
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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 ...
3
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2answers
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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 ...
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2answers
174 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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1answer
117 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 ...
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6answers
624 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 ...
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2answers
807 views

what advantage might a blue-green laser have underwater (if any)?

In various works sci-fi writing, submarines and underwater vehicles/installations are said to be armed with laser weaponry that specifically fire blue-green beams- would such lasers have any actual ...
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6answers
432 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 ...
14
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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 ...
3
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2answers
70 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 ...
3
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3answers
129 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 ...
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6answers
376 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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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
261 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-...
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17answers
10k views

An underwater creature that could take down a boat

Imagine that when Christopher Columbus sailed West in his Carrack to travel around the world to reach India, he had never made it to land, because halfway across the Atlantic Ocean between Europe and ...
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2answers
158 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 ...
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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
212 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 ...
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7answers
227 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 ...
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3answers
602 views

How would an aquatic race of humanoids move as flawlessly as humans do on land?

Assuming the same rules for physics apply to this world as they do for our own, how would a humanoid race that lives at the bottom of the sea be able to walk around like humans do on land? What kind ...
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11answers
580 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 ...
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3answers
286 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 ...
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4answers
935 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 ...
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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 ...
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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 ...
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7answers
3k views

Underwater acoustic muffling/dampening and sonar evasion. Is a stealth torpedo possible?

So I have various factions with submarines and surface ships battling it out for control over various underwater resources. One of the rarer and more lethal weapons is a "stealth torpedo". It ...
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1answer
121 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 ...
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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 ...
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3answers
521 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 ...
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2answers
198 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 ...
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7answers
3k views

What would make good clothing for an underwater species?

A soft and vulnerable intelligent underwater species, you can consider them closely related to Earth's octopus - in the way chimps are closely related to humans. Consider that clothing is often worn ...
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2answers
107 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 ...
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4answers
210 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 ...
9
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2answers
172 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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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 ...
5
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4answers
532 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 ...
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4answers
313 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 ...
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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 ...
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2answers
284 views

How do mermaids map ocean currents?

Humans lay road to gain fast access to distant places until aeroplane is invented, I would presume the mermaids living underwater can make use of the strong water current to get around the ocean ...
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2answers
2k views

How do mermaids' ears work?

Whales and dolphins surely do not have ears similar to ours and yet they can pick up ultrasound underwater without fear of water pressure damaging the eardrum. Any idea how the mermaids with ears like ...
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4answers
4k views

How to explain a mermaid's tail morphing into legs and vice versa?

I know a tadpole can do this transformation, given enough time, so what about mermaids?
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4answers
523 views

Would an average seawater mermaid be any larger than its freshwater counterparts?

Let's use the sea turtle and the terrapin as an example, need I say more? I used terrapin because like the mermaid which is half fish and half girl so a terrapin would serve as an excellent example. ...
5
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1answer
440 views

Does mermaid evolution come with buoyancy control?

I must admit this legendary or mythical creature is really fascinating and I am talking about the half fish half woman. I know most fish have the ability to control buoyancy as they can easily move ...
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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 ...