Skip to main content

Questions tagged [underwater]

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

Filter by
Sorted by
Tagged with
4 votes
1 answer
171 views

Spearguns without rubber?

I want a medieval civilization to be able to hunt under water. However every weapon I can find to spearfish under water seems to be rubber based. I don't want to introduce rubber to my world as it ...
GreedyGroot's user avatar
2 votes
2 answers
129 views

What is the optimal number of fins for maximum maneuverability of an aquatic organism?

I am deciding how many fins to give a race of aquatic "humanoids" for maximum maneuverability in the water. It is a given that they would have tail and pectoral fins because they have very ...
user1181399's user avatar
11 votes
5 answers
4k views

Can I provide sunlight many hundred meters below ground or underwater

I am working on some sort of space colony many metres below the ground or underwater. Is there any way that I can work this idea toward using natural sunlight instead of artificial light source? When ...
trejder's user avatar
  • 2,393
2 votes
1 answer
105 views

How does a bipedal amphibian use its legs in water?

Ok so I'm writing a story with humanoid animals that developed in water but adapted to instead live near large bodies of water like lakes. They have legs and arms as well as a tail (About 5'8feet (...
something_Funny368's user avatar
9 votes
4 answers
2k views

Are humanoid cetaceans evolutionarily possible?

Dolphins are intelligent and live in groups. In my world, there is a magical way to cook food that would be possible underwater. Given that increased calorie availability, could cetaceans evolve a ...
Snorka's user avatar
  • 438
3 votes
4 answers
108 views

How would an underwater race control the breeding for planktonic larvae species?

In order to domesticate wild animals, you must necessarily complete a number of criteria (docility, can't be picky eaters, conforms to a social hierarchy, etc), but above all the most important ...
SuperYoshikong's user avatar
0 votes
0 answers
84 views

How do Mermaids Create Fire? [duplicate]

Fire is useful. It generates heat to warm your house or cook your food, or to lights the fuses of your bombs. It's also handy if you can start a fire underwater and take it to the surface, so you can ...
ArchduchessFerdinand's user avatar
1 vote
1 answer
263 views

Acetylene Manufacture: How would Mermaids do it?

Acetylene is useful for making fire underwater. This might be used for cooking, or so you have a way to start a fire right after coming out of the water, or for some underwater welding. Or, maybe even ...
ArchduchessFerdinand's user avatar
1 vote
2 answers
242 views

Building dams from underwater

A recent question of an underwater race hunting land-based creatures has been answered with "they can build dams" (here https://worldbuilding.stackexchange.com/a/253462/86466). I have ...
Vesper's user avatar
  • 8,145
20 votes
9 answers
4k views

How could an aquatic race hunt land animals?

This is tied to my previous question!: How to allow a sentient cephalopod to live a long lifespan? An intelligent aquatic cephalopod with adults having roughly 15-40 cm long mantle. They typically ...
SuperYoshikong's user avatar
5 votes
1 answer
1k views

Underwater motion detector

Citizens of an underwater city along the Ring of Fire are trying to protect a 50kg object. The object is housed in an underground cavern near the city. How can motion be passively detected in or near ...
user6760's user avatar
  • 48k
2 votes
2 answers
221 views

How would a civilisation that develops underwater create explosives? [duplicate]

So, I'm interested in a humanoid civilisation, only it develops underwater, in a world with no ground above sea level. I want to know, considering ignition with a spark would be, well since, fire and ...
boboranonymous's user avatar
0 votes
1 answer
111 views

Underwater Civilisation warfare [closed]

I'm interested in finding out, for a humanoid civilisation that develops underwater (with gills), how would they develop the equivalent of a modern-day assault rifle, with a minimum effective range of ...
boboranonymous's user avatar
3 votes
6 answers
415 views

How to keep a city floating beneath the surface of an exoplanet's ocean in place?

How would I be able to explain a city that is underwater, floating in place and such. Without it constantly moving. Basically, how can I explain how it stays in place and doesn't get pushed all across ...
DanceroftheStars's user avatar
13 votes
5 answers
3k views

Is it possible for an artesian basin to go underneath a shallow sea while still being freswater?

An artesian basin is an aquifer in which water within permeable rock is kept under pressure between 2 layers of impermeable rock. I don't know if any artesian basin exists like this in real life, but ...
OT-64 SKOT's user avatar
  • 4,654
8 votes
2 answers
311 views

How big can my giant killer-eel grow?

In my fantasy world, Mainspring, the top of the oceans' food chain is the maculatum, a species of giant eel which originated on another plane/dimension. Maculatum reproduce asexually and wthout any ...
MediocreFantasy's user avatar
10 votes
2 answers
2k views

How deep under water could a vessel go?

The Trieste submarine reached the bottom of the Mariana trench using some clever techniques like gasoline ballast, but let's assume the ocean just kept going to the core of the earth (or maybe the ...
Leon Frickenschmidt's user avatar
3 votes
1 answer
1k views

Could a pre-industrial society make a heavy load neutrally buoyant?

I have a society of merfolk in fantasy novel (humans from the waist, fish tail from waist down, biology isn't important in this story, nothing complicated). While the humans are around 1850s tech, the ...
WasatchWind's user avatar
  • 3,197
16 votes
8 answers
3k views

Why would modern humans not use scuba gear for missions underwater? (But freedive instead)

I am writing the lore for a currently in-development open-world freediving adventure game and am stuck with trying to keep some things scientifically founded. Overall the game style is closer to ...
DragonGamer's user avatar
15 votes
1 answer
2k views

On a planet with larger gravity, would aquatic creatures be larger or smaller?

It is somewhat common knowledge in the worldbuilding community that larger planets leads to smaller land creatures, because larger planets means more gravity gets bigger and that makes it harder to ...
Murphy L.'s user avatar
  • 1,341
5 votes
4 answers
296 views

City planning underwater

In my world, there is a race of fish people and merfolk. For a brief description: They are a mix of the Creature from the Black Lagoon and Luca. For pictures and extra description: What conditions ...
Crafter's user avatar
  • 2,601
7 votes
5 answers
1k views

Would merfolk need beds?

The merfolk are fully marine creatures with a mix of human and piscine traits. The culture in question is demersal, and constructs cities and towns upon the sea-floor. The merfolk all have a finned ...
Ichthys King's user avatar
  • 16.2k
4 votes
2 answers
208 views

Would Merfolk Cheapen Sea-Silk?

Sea silk is an expensive textile derived from the byssus of pen shells. While it is evidently quite hard for land-dwellers to obtain, it seems uncertain if the same would be true with marine beings ...
Ichthys King's user avatar
  • 16.2k
15 votes
7 answers
3k views

How to allow a sentient cephalopod to live a long lifespan?

In this alternate earth, during the Permian period, a sentient aquatic cephalopod species evolved intelligence equal if not superior to humans. Unfortunately, there's a big problem to a cephalopod ...
SuperYoshikong's user avatar
5 votes
3 answers
323 views

Could the 'underwater glider' concept be applied to a 4000-tonne, 80m submarine?

Underwater gliders propel themselves through the water in an interesting way. They empty their tanks to float up, fill them to sink, repeat, going up and down rhythmically. But instead of just going ...
wokopa's user avatar
  • 4,735
20 votes
11 answers
7k views

Could a submarine 'sail' the ocean currents?

A sail generates propulsive force by the difference in pressure on the concave and convex sides. This principle of fluid dynamics should be true of seawater as it is of wind. And the seas do have ...
wokopa's user avatar
  • 4,735
3 votes
2 answers
375 views

What conditions could fish people evolve to be in their current humanoid form?

My fish people live in underwater nations. They look like a mix between the Creature from the Black Lagoon (left) and the sea creatures from Luca: with the exception of some minorities that resemble ...
Crafter's user avatar
  • 2,601
7 votes
7 answers
2k views

Violence in waterworlds -- How do you (gun)fight underwater?

In waterworlds where people live mostly under water or have access to bodies of water how is violence perpetuated in close quarters? Projectiles lose their power really fast making them unviable. ...
pinegulf's user avatar
  • 405
2 votes
0 answers
136 views

How could an underwater society industrialize? [duplicate]

In my world, there is a species of underwater people. They are a mix of the creatures from Luca, and the creature from the Black Lagoon. At some point, when their technology progresses, they learn ...
Crafter's user avatar
  • 2,601
12 votes
6 answers
3k views

What natural ocean resources can be used to make into clothing?

I have a civilization that lives not exactly underwater, but completely surrounded by water in which their cities are both submerged underwater or built floating right on top of it. Almost all of ...
Kass's user avatar
  • 121
11 votes
3 answers
413 views

What sort of music could octopi play?

It can be really hard to distinguish between sounds and find the source of a sound underwater. How could an octopus musician play music with defined notes that are not blurred (significantly) or ...
Alphys's user avatar
  • 193
18 votes
3 answers
2k views

Would Underwater Races be Near or Farsighted?

Light travels differently in water and air. Some of that is because of light's speed in a substance, and some is the light absorption that substance exhibits. Is the difference in light scattering ...
Paradoc's user avatar
  • 523
20 votes
9 answers
3k views

What's a reasonable environmental disaster that could be caused by a probe from Earth entering Europa's ocean?

I'm working on a story involving life on Europa (or at least a place just like it) being upturned dramatically by contact from a probe sent from Earth. Found this community while researching, and have ...
Brooke's user avatar
  • 261
0 votes
2 answers
115 views

Biology — A group of humans that magically became aquatic [closed]

In my setting, some humans hundreds of years ago became aquatic due to magic (the same setting has vampires pretty much like in the original Dracula novel, who descend from one guy who became a ...
Nuke's user avatar
  • 9
10 votes
6 answers
1k views

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 ...
wokopa's user avatar
  • 4,735
6 votes
4 answers
1k 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 ...
Kurtalmakthekoboldkiaser's user avatar
1 vote
0 answers
83 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?
David Spangler's user avatar
3 votes
3 answers
436 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 ...
sirOrange17's user avatar
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 ...
Monty Wild's user avatar
  • 62.8k
14 votes
14 answers
6k 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 ...
Mattna's user avatar
  • 562
6 votes
2 answers
281 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 ...
Lila's user avatar
  • 61
1 vote
3 answers
220 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,...
nights's user avatar
  • 119
5 votes
5 answers
328 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 ...
Grhadri's user avatar
  • 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 ...
Mark Price's user avatar
  • 2,438
9 votes
7 answers
2k 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 ...
BoaHancocklover's user avatar
2 votes
1 answer
141 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 ...
Nyctophobia457's user avatar
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 ...
Nyakouai's user avatar
  • 4,613
2 votes
2 answers
1k 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). ...
ak7's user avatar
  • 473
3 votes
2 answers
572 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 ...
twilightstar's user avatar
1 vote
3 answers
220 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 ...
Hizzler's user avatar
  • 29

1
2 3 4 5 6