Questions tagged [underwater]

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

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4answers
95 views

Could plankton create civilisation? [closed]

Could a species of planktonic beings, with sufficient intelligence, creativity, and physical ability to manipulate objects, create a technological civilisation at the same level as humans? While being ...
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1answer
59 views

Irrigation in ancient societies [duplicate]

In what kinds of environments would the irrigation of crops require authoritarian governments ? This would be about ancient pre industrial societies.
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8answers
3k views

Could merfolk cook without air by using electrical heating?

Basically title. You can't light a fire to cook your food because everything's all wet and there's no air you see. But can you take some raw meat, apply an electric eel to it for 20 minutes, turning ...
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3answers
1k views

How do submariners contribute to the surface-world?

If there are people living deep underwater swishing around in nice submarines, how will they provide value to normie landlubbers? http://theoildrum.com/node/4558 all but rules out the possibility they ...
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1answer
112 views

Could a creature swim using an organic dress?

Could a creature swim through water (faster than the average human) using a fin that wraps around the body like a dress or skirt? Specifically, the fin would surround the rear end in a circle, with a ...
3
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1answer
59 views

How would merfolk sustainably magically grow coral?

This question is a modified version of my earlier question, where I will clarify some of my worldbuilding. In my world, merpeople are capable of manipulating coral by making it grow at a faster rate ...
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9answers
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Could a non-nuclear sub power itself by ocean energy?

The sub would be about the size of: the Sōryū class, which displaces 4200 tonnes (implying about 4200m³ volume) and has a 6000kW propulsion system the Oyashio class, which displaces 4000 tonnes (...
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2answers
90 views

What consequences could arise from merpeople magically growing coral?

In my fantasy world there are merpeople who have a magical ability to manipulate coral, they can make corals grow at a much faster rate than it naturally would, as well as control the shape it grows. ...
6
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4answers
409 views

How can my low tech free diving species ventilate their homes?

I have an air breathing species that, for reasons of Plot, spend most of their time underwater. They’re pretty much comparable to humans in everything except how long they can hold their breath. ...
7
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7answers
384 views

How can you breathe underwater?

SCUBA equipment is pretty amazing, allowing us to breathe underwater and explore. But they have drawbacks: they're noisy, cumbersome, and time-limited. It seems like a futuristic scenario would ...
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4answers
270 views

Are low-energy submarines possible?

I'm envisioning submarines just cruising around doing normal things, taking the role of cars, trucks, RVs. I'm trying to estimate how much energy they would need. https://en.wikipedia.org/wiki/...
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1answer
71 views

What kind of biological modifications can make humans survive rapid resurfacing?

Context: After reading this question and commenting (half joking) that it might be possible for the designated mech pilots to undergo biological modification to remove the problems typically ...
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3answers
135 views

What technology would be necessary to allow soldiers to ascend rapidly from deep in the ocean and to the surface?

In my world, submarine technology and ocean exploration is highly sophisticated. A large sub can house hundreds of people in addition to smaller subs and they are used to travel, kind of like ...
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15answers
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Why would mechs be used in underwater combat but not on land?

In my world, the planet (which is not Earth, but is suitably Earth-like) has been besieged by deadly monsters for about 1000 years. Their initial attack lead to an apocalyptic scenario which took ...
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4answers
120 views

Ideas for underwater electrocution weapon?

Are there any electronic devices that can be used to electrocute people in water, like, say, beach goers in the ocean? The weapon would need to be installed under the water in advance and then be ...
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4answers
146 views

What material could merfolk use to make rope?

I have a fantasy world with merfolk in it who have their own underwater civilization. While they are capable of trading and obtaining material from humans I want to figure out how much technology they ...
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5answers
878 views

How would merfolk food presentation look like?

In my world there are merfolk who live in their own underwater civilization. They are sapient with unique and complex social customs, and one of them involves food. Just like on land, merfolk royalty ...
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5answers
167 views

What method of waste disposal would be the most practical for merfolk?

While worldbuilding my merfolk society I've been thinking about what method of waste disposal they would use. I've come up with a few ones that I will describe, and ask how practical they are, and if ...
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7answers
1k views

Could merfolk create pottery and other vessels for storage?

I've got a fantasy setting set in a world based on the ancient near east ca 500 B.C. In it there are merfolk who have contact and trade with local humans. The merfolk are physically more similar to ...
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5answers
4k views

What would happen if a huge solid ball (temperature zero kelvin) of helium appeared suddenly in a deep sea?

I'm writing a story about an icy alien culture which applies ultracold helium bombs that they can make appear at any place. The battle between good and evil translates in hot and cold. Though of ...
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2answers
165 views

Why would an animal have facial doors? [closed]

The facial door is a unique structure. They are surrounded on both sides by a row of tusks, and are composed of a pair of plates, which are supported by a bony core that is jointed to the skull, and ...
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2answers
144 views

What is the viability of mineral-infused seawater as an effective conductor for an aquatic species' electrical needs?

In another post on this brilliant site I saw someone suggest that an aquatic species could make insulated tubes filled with seawater to transmit electricity, with the only downside being that seawater ...
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2answers
326 views

What kind of house would merfolk build?

In my fantasy setting there is a species of merfolk who live in the ocean. They have hands with human level of dexterity and can live completely underwater. I would want to ask a question about what ...
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2answers
134 views

What Adaptations To Human Physiology Would Be Necessary To Be Able To Use Echolocation Underwater?

After watching this video about humans being able to use echolocation, I began to wonder if this same idea could be used underwater. Could a human be able to use echolocation underwater without any ...
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2answers
279 views

Can a dry suit exist for a furred creature?

Broadly speaking, a dry suit is a garment which restricts fluid exchange between the portion of the body covered and the outside environment. These work for humans because it is not unreasonably ...
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6answers
3k views

How to make "humans" that can hold their breath for a long time?

Let's say I have an aquatic humanoid, vaguely like a selkie. As creatures that spend a lot of time in water, it would be great if they can stay under water for "a while". The human breath-...
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2answers
171 views

What Would Be The Advantages Or Disadvantages Of Merfolk Having Extra Fins?

I've always liked the idea of merfolk having extra fins(by this I mean fins like the dorsal and pectoral ones and not the main tail fins). After seeing this article about how fish use their many types ...
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7answers
904 views

What sort of texts would survive in a sunken ruin?

Hundreds of years ago, the once-opulent city of not-Atlantis incurred the wrath of the gods and was cast to the bottom of the ocean. Now, our intrepid adventurers have been sent to the lost city of ...
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3answers
127 views

Plausibility of this submerged smelter design?

This design involves a regular smelter, housed in a large water-proof shell that completely covers it. The lower part of the shell would be exposed to the surrounding water. The shell would be filled ...
4
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1answer
110 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, ...
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5answers
205 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 ...
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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 ...
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2answers
150 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 ...
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0answers
33 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 ...
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4answers
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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 ...
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1answer
272 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?
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7answers
4k views

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 ...
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2answers
359 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....
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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 ...
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6answers
363 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 ...
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2answers
129 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 ...
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7answers
3k 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-...
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4answers
250 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. ...
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3answers
840 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 ...
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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 ...
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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
164 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, ...
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3answers
360 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 ...
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2answers
137 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
155 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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