Questions tagged [underwater]

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

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99 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
187 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
129 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 ...
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3answers
114 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
73 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
73 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
91 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
122 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 ...
7
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2answers
190 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
80 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 ...
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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3answers
137 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
218 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
265 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
160 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
215 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
229 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 ...
1
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3answers
288 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
937 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
224 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?
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1answer
122 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
538 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
200 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
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 ...
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
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 ...
0
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4answers
212 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 ...
6
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5answers
616 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
319 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 ...
12
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11answers
623 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 ...
10
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6answers
439 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 ...
46
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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
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2answers
232 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
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3answers
252 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 ...
25
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8answers
13k 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
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2answers
331 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
231 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 ...
0
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3answers
168 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
290 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
145 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
90 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
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8answers
919 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 ...
10
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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
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3answers
270 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
452 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
336 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 ...