Questions tagged [underwater]

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

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Why would hydrogen bubble up from the sea floor?

I am thinking of a world where bubbles of hydrogen emerge from the seafloor, and are trapped by people for use as fuel. But what is the source of the hydrogen? In other words, what geological or maybe ...
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6 votes
4 answers
974 views

The believability of flesh eating plankton

Context I am disigning a place called the Poisoned Sea, see this question for description, there are clouds of purple plankton that eat the tough flesh of the dead God-Eaters and anything that enters ...
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1 vote
0 answers
76 views

Underwater life on a 3G world [closed]

I'm creating a 3G ocean world and am wondering how the heavier gravity would affect life under this ocean?
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3 votes
3 answers
271 views

Is a Nuclear Thermal Propelled Submarine Possible?

So I've recently read about NTR's and how they can be applied in space. Here is a link to the website that I've looked at: http://www.projectrho.com/public_html/rocket/enginelist2.php#ntrsolidcore It ...
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14 votes
7 answers
4k views

How safe would deep-sea investigation of a nuclear battleground be?

Jormungandr, the snakebot of doom, is no more. Its remains are lying on the bottom of the sea in the Aleutian Trench to the south of the Rat Islands, where it was nuked to pieces by three hundred ...
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15 votes
14 answers
5k views

Weapon design for underwater hand-to-hand combat

Most hand-to-hand weapons are already streamlined for the obvious reason of minimizing air resistance. But would the same design work for underwater warfare? My story has a character who is ...
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  • 484
6 votes
2 answers
156 views

Merfolk Beauty Products (part 1: makeup)

What could an underwater civilization use to produce makeup and cosmetics? Considering that: The merfolk's tech level is the same as ours (they have fire and metallurgy thanks to magic) Makeup ...
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  • 61
0 votes
3 answers
162 views

What could be ethical reasons for deep sea mining? [closed]

Unfortunately in real-life on our planet (Earth) deep sea mining for rare earth minerals is devastating to biological ecosystems and has very little motivations beyond the capitalistic/industrial ones,...
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  • 109
5 votes
5 answers
243 views

Is an Underwater œcumenopolis viable?

An important planet in my setting is an ocean planet with a few atolls as its landmass. I intend the planet to be an underwater oecumenopolis (imagine a planet-spanning Rapture from Bioshock). Most ...
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  • 197
5 votes
5 answers
1k views

Hyper-Agile Submarines?

Building off of another question I asked about the realism of short-range combat in the future, I was thinking about making combat scenarios with small, hyper-maneuverable submarines. These submarines ...
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  • 1,342
9 votes
7 answers
1k views

What materials would merfolk use to craft armor?

What materials in the environment could merpeople use to make armor? The merpeople live in the mediterranean sea and have contact and trade with humans who could provide resources and craft the armor ...
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2 votes
1 answer
78 views

What would be the technological limitations of an advanced aquatic species? [duplicate]

My latest idea for worldbuilding involves a world in which the surface of the planet is 95% of the planet's surface covered in saltwater (there are still minerals and other collectible resources on ...
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18 votes
6 answers
3k views

Impact of a massive and static super predator in migration path

I'm in the process of adding the fun parts to my world, and I'm a bit perplex on this one; Premise Let's assume a fantasy ooze An ooze is a mindless carnivorous blob of jello - think cube-shaped or ...
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2 votes
2 answers
239 views

How quickly will the oceans freeze if Earth becomes a rogue planet?

Assume Earth has been wrenched out of the Sun's orbit and has become a rogue planet (for the purposes of this question, assume that it happens near instantaneously, i.e. say the Sun just vanishes). ...
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  • 463
2 votes
2 answers
157 views

How would an underwater city be structured? [closed]

Let's say there is an underwater civilization of merpeople. They were able to develop medieval technology (approximately, since an underwater civilization would develop differently than an above water ...
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  • 787
1 vote
3 answers
168 views

How would humanity fight against a neolithic aquatic race

In the early 1950s an aquatic race called merfolk for simplicity sake was discovered. But they weren't friendly in order to scare them off the crew that discovered them fired off a warning shot which ...
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  • 29
0 votes
4 answers
121 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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-2 votes
1 answer
73 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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14 votes
8 answers
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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4 votes
3 answers
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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  • 1,561
0 votes
1 answer
138 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 ...
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3 votes
1 answer
81 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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9 votes
9 answers
2k views

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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3 votes
2 answers
95 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. ...
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6 votes
4 answers
417 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. ...
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7 votes
7 answers
412 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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  • 1,561
6 votes
4 answers
288 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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  • 1,561
1 vote
1 answer
82 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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  • 1,171
4 votes
3 answers
156 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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  • 918
15 votes
15 answers
5k views

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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  • 918
2 votes
4 answers
143 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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5 votes
4 answers
224 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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8 votes
5 answers
931 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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3 votes
5 answers
210 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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7 votes
7 answers
2k 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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8 votes
5 answers
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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0 votes
2 answers
174 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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3 votes
2 answers
159 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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6 votes
2 answers
444 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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4 votes
2 answers
143 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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  • 149
5 votes
2 answers
291 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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23 votes
6 answers
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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  • 14.1k
7 votes
3 answers
248 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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  • 149
10 votes
7 answers
981 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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  • 2,121
2 votes
3 answers
135 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 ...
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  • 11.7k
4 votes
1 answer
117 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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  • 11.7k
10 votes
5 answers
208 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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  • 11.7k
7 votes
8 answers
4k views

Could a 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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  • 111
7 votes
2 answers
192 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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11 votes
4 answers
3k 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 ...
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