Is it possible to ?

[GunslingerUK]

Is it possible for mankind to build a city underwater and how would we do it?

To be honest my theory would be the exact way we build normal buildings, but after making the domes or what ever the roofs going to be like they would drain the inside and depressurize it.

That theory's logical but I don't like logical I prefer making it up, so whats your plan of making a city underwater?

 

[Adam Jenson]

Its possible but I have to say theres no challenge. What I'm looking forward to is a ship that can support an entire city

 

[blubuddy]

i dont think so, it's hard enough to get humans to the bottom of the ocean let alone build there

 

[howard_hughes]

The real question we need to ask ourselves isn't if it's possible but if it's cost effective.

 

[GunslingerUK]

The theory is possible to some extent. If submarines to go to the lowest depth of extreme pressure there must be some scientist has had that idea pop into his head.

 

[orifice]

Is it possible for mankind to build a city underwater and how would we do it?

To be honest my theory would be the exact way we build normal buildings, but after making the domes or what ever the roofs going to be like they would drain the inside and depressurize it.

That theory's logical but I don't like logical I prefer making it up, so whats your plan of making a city underwater?

Depressurization would cause an implosion by water pressure. What you need to do is pressurize said structure.

 

[Reaperman Wompa]

We'd need some clear substance that could withstand the pressure (no one wants pretty much an underground non mobile submarine). Power would also be a problem. Also looking at problems with flooding and water seeping would be hugr. So would be finding food other than fish, plus transportation between the surface and the sea bed would be extremely hard or inefficient, then theres the fact that that this city couldn't have much recognizable use. Tourism? It's deep so you can't see shit and for fishing (or sea kittening) it just doesn't merit the building of an entire city.

This is of course referring to deep sea. Something a few meters below sea level could make a very nice tourist spot, barring flooding.

 

[GunslingerUK]

Valid.

All i want to see is a man who is wearing a suit with a drill for a hand.

 

[Danny Ocean]

If submarines to go to the lowest depth of extreme pressure

Not true, most modern subs collapse at about 730m. [http://en.wikipedia.org/wiki/Crush_depth]

The pressure difference is so great that it would be more difficult to build a city on the sea floor than on the moon.

Look at it this way, space is at 0 atmospheric pressure. Our atmosphere is at 1ap. That's a difference of 1. Easy.

The average depth of the Ocean is 3790 meters [http://en.wikipedia.org/wiki/Ocean#Physical_properties]. That means an average of 379 atmospheric pressures.

That's a difference of 378. That's a lot harder.

 

[GunslingerUK]

Danny did you go and research?

 

[Dommyboy]

Give Andrew Ryan and a few of his favored scientists a large amount of money and tell him to get cracking.

 

[GunslingerUK]

well of course the very bottom of the sea is dangerous on a massive scale.

How about building the entrance on land and a have the complex at a depth that is stable.

 

[Danny Ocean]

From what i understand, at certain depths if a submarine ruptures the large areas fill with water, the pressure increase can actually superheat the air. Not a nice way to go.

How would that work? Surely increasing the pressure would cool the air as it is forced down a phase?

Danny did you go and research?

Yes. Yes I did. I haven't eaten in 17 hours and I only slept for 5 hours last night. I can be anal if I want.

How about building the entrance on land and a have the complex at a depth that is stable.

Well that isn't very deep, so what's the point?

Regardless, you'd need to practically run the whole place off hydrogen. Recycle people's breathing to extract the O from Co2 and then put that O back into the air. The C can be used as a catalyst for whatever.

Extract hydrogen and oxygen from the water. Breath the oxygen, burn the hydrogen. And don't throw stones.

 

[GunslingerUK]

Gold star to Danny for researching.

back to business, when i say at a safe depth i at least mean as much as the complex can take.
ill risk it a little bit.

 

[sirdanrhodes]

I say that we need to go underwater SOON, because half of the world will be anyway. I am in the Midlands of the UK, and if science is correct, I am safe.

 

[Meatstorm]

we dont really need them that much, instead people should be researching genetic mutations that can give us ability to shoots bees

 

[Alex_P]

[quote="corroded" post="1How would that work? Surely increasing the pressure would cool the air as it is forced down a phase?

I doubt the "super" part, but it'll definitely heat up the air.

Raising pressure increases temperature. Think back to the ideal gas law or van der Waals' equation.

You're correct in thinking that increased pressure can cause a phase change, but that's because you're shifting the boiling point. (IIRC, oxygen and nitrogen have critical points around 100 K, anyway, so increasing pressure at room temperature wouldn't result in a "clean" phase change anyway -- you'd get a "supercritical fluid".)

The ocean isn't going to produce the kinds of temperatures and pressure needed to liquify air.

-- Alex

 

[Combined]

Personally, I don't want another Rapture.

Other than that, It probably IS possible to build a city underwater, but it'd probably be extremely costly and we don't want that now, do we?