Sustainability for more than 8 dupes - how the hell?

[psusi]

So I'm 774 cycles into this world and have been doing fine with only 8 dupes.  I have what appears to be a fairly monster steam vent that I've been using as a source of water for some time, cooling with the AETN.  It does 5.2 kg/s for 91.2s every 156.7s for 91.2 out of every 156.7 cycles.  According to the geyser calculator, that is better than 83% of steam geysers.  I've been using this water to run two electrolysers to supply oxygen.  For food I've been using mushrooms for most dupes thanks to morb fed pufts, with my top two dupes ( exosuit engineers ) eating bbq thanks to all of the meat from ranching and wild grown pinapeppers.  I have a second steam vent I have yet to dig out, a chlorine vent ( nearly useless ), and I recently discovered a *second* gold volcano, and one natgas vent.  I now have a steam turbine set up to delete heat from the metal refinery producing steel to try to get into rocketry and was thinking of digging out the other steam vent to use up more of the cooling potential of that turbine and expand my colony.

Here's the thing.  According to the calculator, this one monster steam vent could grow 52 sleet wheat, which could feed 40 dupes ( if I could also keep up with the dirt ), yet that would require 7 electrolyzers for oxygen, and one of these vents can only supply less than 2.  How the hell are you supposed to sustain a larger number of dupes?  It seems like it just takes too much damn water to produce oxygen.  Forget about using water on the oil well or steam rocket.  Do you *have* to have a slush geyser or something in order to get enough water?

 

[SkunkMaster]

You have to make power positive systems. 

 

Like cooking oil into petrol, or even better, sour gas. then use those resources since that creates water. cleanse the water and repeat said cycle. 

this process is water positive, so you'll get more water out then you put in. It is also power positive, good for powering your base.

[psusi]

22 minutes ago, SkunkMaster said:

You have to make power positive systems. 

 

Like cooking oil into petrol, or even better, sour gas. then use those resources since that creates water. cleanse the water and repeat said cycle. 

this process is water positive, so you'll get more water out then you put in. It is also power positive, good for powering your base.

I don't lack in power; what I lack is water.  I am running a natgas generator but it doesn't seem to make very much polluted water.  Are you suggesting that I need to run it more ( not sure how much more I could run it off of this one natgas vent ), waste the power, and that somehow would make the tons of water needed?  I don't see that coming to fruition.  Or use the water that I have to produce oil from the oil resivoir, cook that into petrol, and run a petrol gen full time, throwing out the power it produces, only to create more polluted water that the fresh water it took to extract the oil?

[SkunkMaster]

You turn oil, into sour gas, you condense the sour gas and run nat gas gens with it. the gens produce more water then was used to make the oil with the well, the oil you cooked into sour gas.

 

so yes, i suggest you run the nat gas gens more, but that you use nat gas that you've made your self.

[KittenIsAGeek]

There are several ways to get more water. 

1. Melt your ice biomes (but don't dig!)
2. Run your nat-gas generators continually.  This may involve some tricks like the crude to sour gas boiler systems -- using the refineries aren't water positive.  Also you'll get more water per unit crude if you go nat gas instead of petrol.
3. Avoid wasting water.  This includes: Cooking mealworms or mushbars, growing thimblereed in hydroponics, growing bristlebloom as a food source OTHER than berry sludge
4. On that note, Research uses a LOT of water.  If you're short on water, stop doing research for a bit and try to find some more sources.
5. Don't vent your water into space.. I know, the steam rocket needs water to run, but that's the ONLY time you should be losing water (including polluted water) to space.
6. Supplement your oxygen supply with algae terrariums. A total loss of 9.67g/s of water for 40g/s (44 under a light) of oxygen is 4.5g/s of oxygen per 1g/s of water compared with 0.888g/s oxygen per 1g/s of water making it 5 times more efficient.  Yes, you have to empty the polluted water bottles and use a sieve, but every gram of water counts when you're trying to go sustainable.
7. Lavatories, not outhouses.  Every time your dupe does his business on the throne, you'll gain a little extra something in your polluted water pool.  Outhouses don't generate any water -- and the amount of water provided by 40 dupes using latrines actually adds up.  With 10 dupes (two of which have Diver's Lungs and two have small bladder) you can provide a a good portion of their oxygen needs just from the excess water off the latrines.

 

[Neotuck]

1 hour ago, psusi said:

According to the calculator, this one monster steam vent could grow 52 sleet wheat, which could feed 40 dupes ( if I could also keep up with the dirt )

how would you keep up with the dirt?

for 52 sleet wheat you would need 433g dirt per second

that's like having almost 5 compost piles working non stop

where do you plan to get all the compostables to make that kind of dirt?

[Mr.Trueba]

@psusi

What are you doing to have not enough water?

I always have between 18-24 dupes and water for like easily 50 more.

Do you have the save file? I can help if I ser what you are doing. (:

[Fischer_L]

I don't know if it positive system... But now you can launch rocket... and get infinite methane, ice, polluted water, polluted ice, slime (algea distiller produced PW). 

Also, as now you can recharge vascilators, you can have deep diver's lung on all your dupes, which cut their oxygen (read water for electrolyzer) in half. But it can take a very long time...

If you preserve wild plants you can easilly support 10+ dupes, wich also cuts water consumption.

[Sasza22]

5 hours ago, psusi said:

Or use the water that I have to produce oil from the oil resivoir, cook that into petrol, and run a petrol gen full time, throwing out the power it produces, only to create more polluted water that the fresh water it took to extract the oil?

This is actually water positive iirc. You get more water from the oil and nat gas the well produces than you use to pump it out.

Late in the game you can send rockets to ice planets for extra water. I`m not sure how efficient that is but it`s a solution.

[crypticorb]

7 minutes ago, Sasza22 said:

This is actually water positive iirc. You get more water from the oil and nat gas the well produces than you use to pump it out.

Late in the game you can send rockets to ice planets for extra water. I`m not sure how efficient that is but it`s a solution.

How much ice/water can a cargo hold contain? I still have yet to reach space exploration.

[Sasza22]

4 minutes ago, crypticorb said:

How much ice/water can a cargo hold contain? I still have yet to reach space exploration.

I think 1 cargo module holds 1 ton of resources overall. So if you go to an asteroid with 40% ice and 30% polluted ice you should get 400kg and 300kg respectively.

I don`t know if there are destinations with liquid water but that seems like it would be more efficient as you`d only get the liquid.

[Carnis]

35 minutes ago, Sasza22 said:

I think 1 cargo module holds 1 ton of resources overall. So if you go to an asteroid with 40% ice and 30% polluted ice you should get 400kg and 300kg respectively.

I don`t know if there are destinations with liquid water but that seems like it would be more efficient as you`d only get the liquid.

Organic mass had liquid polluted water on rocketry, that being said its not cost effective to get it atm.

Suggestions regarding sour gas need super coolant and insulator from space, so boilin oil to water seems out of (casual) reach.

Before with NG it was hard but manageable.

*

If your geyser produces on average 2kg/s this should alone support 18-20 duplicant. If your geysers have high output/second (way over 7kg/s), then you must get tempshift diamond plates around the geyser & make sure your Steam condenses quickly. Otherwise, your Steam might overpressure every now & then losing production.

[ToiDiaeRaRIsuOy]

What is the conversion rate of sour gas to natural gas (methane)?

Boiling oil to petroleum will net you a net profit of 25% of water. Meaning every 1kg of water you put into an oil well, will eventually net 1250kg of polluted water if you boil oil into petroleum (which is a 1:1 conversion). Also, that 1kg of water nets you 250g of CO2, which is another 125g of petroleum through molten slicksters, which is an additional 46,875g of water.

If I assume the conversion rate of sour gas to natural gas is 66% (so a mass loss of 33% which goes to sulfur), you will actually have a net profit of 66% of water (because the natural gas generators yield much more water per amount of burnable mass). CO2 production is 166.5g, which when converted to natural gas yields down the line an additional 41.21g water.

[Carnis]

23 minutes ago, ToiDiaeRaRIsuOy said:

If I assume the conversion rate of sour gas to natural gas is 66% (so a mass loss of 33% which goes to sulfur), you will actually have a net profit of 66% of water (because the natural gas generators yield much more water per amount of burnable mass). CO2 production is 166.5g, which when converted to natural gas yields down the line an additional 41.21g water.

Its 66%. @Ainsley4ever has the best working model at the moment.

Complex build.

[clickrush]

Having slush/polluted water/water geysers on your map makes things easier and more accessible in the long term. But I'am almost certain that it is now possible to scale up a base indefinitely with the new late game materials as long as you have enough space on the asteroid.

The big game changer here is the material that increases the overheat temperature of buildings by 900°C. This means you can create an infinite loop of cooking oil and get water and power out of it.

On top of that you can get more and more stuff with your rockets. I assume it is possible to get any of oil/petroleum/CO2/natgas.

However 99% of the players shouldn't worry about that, especially not after a couple of hundred cycles. The asteroid holds enough water regardless of geyser output, even if you have 3-4 times as many dupes as you have right now, to not run out before most people get bored.

 

[ToiDiaeRaRIsuOy]

50 minutes ago, clickrush said:

Having slush/polluted water/water geysers on your map makes things easier and more accessible in the long term. But I'am almost certain that it is now possible to scale up a base indefinitely with the new late game materials as long as you have enough space on the asteroid.

The big game changer here is the material that increases the overheat temperature of buildings by 900°C. This means you can create an infinite loop of cooking oil and get water and power out of it.

On top of that you can get more and more stuff with your rockets. I assume it is possible to get any of oil/petroleum/CO2/natgas.

However 99% of the players shouldn't worry about that, especially not after a couple of hundred cycles. The asteroid holds enough water regardless of geyser output, even if you have 3-4 times as many dupes as you have right now, to not run out before most people get bored.

 

I always see space as that little bit extra. In my opinion, you can't depend on space to run a sustainable colony because it takes way too long to reach the means of launching your rocket.

So psusi basically is a bit stuck with his current dupe count. Yes he can harvest the whole asteroid, but that also takes up precious duplicant time. The further you have to reach, the more time it takes. To the point extra dupes aren't necessarily worth the hassle. I think he can afford a few extra dupes currently though.

If I was him, I'd instead ramp up efficiency. He should produce as much as polluted water as he can as usually the conversion from water to polluted water increases mass of it. He also mentioned a cool steam vent he has to dig out. If that steam vent is actually one covered by materials (instead of tiles sitting around it), it means he definitely has 1 more cool steam vent somwhere on the map.

[SakuraKoi]

1 hour ago, Sasza22 said:

Late in the game you can send rockets to ice planets for extra water. I`m not sure how efficient that is but it`s a solution.

Welp, let's do some math again, with my chart and the calculator, not to mention for fun~

My planetary chart says:

 

 

Spoiler

Ice Planet, 30k km Distance

• 19% Ice
• 25% CO2
• 31% O2
• 25% Methane
• all Solid

Organic Mass

• 21% Slime (solid)
• 19% Algae (solid)
• 17% Polluted Water (liquid)
• 19% PO2 (gas)
• 21% CO2 (gas)
• Let's make it 100% Polluted Water, and 50% all else, more simple that way and as accurate

First, how to get there with the most efficiency of fuel-to-cargo. Mind you, this time I use Liquid Oxygen (divided by 1.33) and rounded to 100

Spoiler

Petroleum 40k km

• 900kg for 1t Cargo 
• 1300kg for 2t Cargo
• 3 Impossible

Hydrogen 40k km

• 600kg for 1 Cargo 
• 800kg for 2 Cargo 
• 1400kg for 3 Cargo

Petroleum 50k km

• 1100kg for 1t Cargo 
• 1700kg for 2t Cargo (just sliiightly better but nonetheless)
• 3 Impossible

Hydrogen 50k km

• 700kg for 1 Cargo 
• 900kg for 2 Cargo 
• 1700kg for 3 Cargo

So 2 Cargo Bays is always advisable, so what will be get?

• P40k and H40k: 380kg Water. 500kg CO2, 620kg O2, 500kg Methane
• P50k and H50k: Either 1000kg Slime and 1000kg Algae OR 2000kg Polluted Water OR 1000kg CO2 and 1000kg PO2

 

P40k and H40k:

Now lets turn it all into Petroleum, Hydrogen, Water and Oxygen, only rounded to full kilogram

 

Spoiler

380kg Water

• 1267kg Petroleum
• 46kg Hydrogen and 334kg O2

500kg CO2

• 250kg Petroleum
• 111kg Water
• 11kg Hydrogen and 99kg O2

620kg O2

500kg Methane

• 370kg Water
• 1083kg Petroleum
• 41kg Hydrogen and 329kg Oxygen

 

So, after processing, you get...

• 861kg Water and 620kg O2
• 2600kg Petroleum and 620kg O2
• 98kg Hydrogen and 1382kg O2

From 1300kg Petroleum and 977kg O2 or 800kg Hydrogen and 602kg O2

 

P50k and H50k

Again, lets turn it all into Petroleum, Hydrogen, Water and Oxygen

Spoiler

Case Solid

1000kg Slime

• 666kg Water and 300kg Oxygen
• 74kg Hydrogen and 892kg Oxygen

1000kg Algae

• 910kg O2

Case Liquid

2000kg PWater

• 6666kg Petroleum
• 224kg Hydrogen and 1776kg Oxygen

Case Gas

500kg PO2

• 900kg O2

1000kg CO2

• 500kg Petroleum
• 222kg Water
• 22kg Hydrogen and 198kg O2

So, after processing, you get...

• (For Solid) 1782kg O2 and 74kg Hydrogen OR 666kg Water and 1190kg O2
• (For Liquid) 6666kg Petroleum OR 224kg Hydrogen and 1776kg Oxygen
• (For Gas) 500kg Petroleum and 900kg O2 OR 222kg Water and 900kg O2 OR 22kg Hydrogen and 1098 kg O2

For 900kg Hydrogen and 677kg Oxygen OR 1700kg Petroleum and 1278kg O2

 

My conclusions:

• Petroleum FTW!
• 2 Cargo Bays
• Liquid from the Organic Mass for ezmode/easy processing
• Ice planet if you can melt it all, plus heat parts of it to over 400°C and cool it way down again, just to condense it 
• Surplus Hydrogen to the Organic Mass
• Ice planet for Water
• Fuel consumption can actually be lowered 
• Only do it after getting Liquid O2, the difference between Oxylite and LOX is drastic

Note about factors I used, some may disagree (especially with the use of Deoxidizers but also Electrolyzers for Oxygen, ofc there is a better mean):

Spoiler

• Factor for Water=>Hydrogen is 0.122 (Electrolyzer)
• Factor for Water=>O2 is 0.888  (Electrolyzer)
• Factor for Water=>Petroleum is 3.333  (Oil Well+Cooking)
• Factor for CO2=>Petroleum is 0.5 (Slickster+Cokking/Molten Slickster)
• Factor for Methane/NG=>Water is 2/3 (Generator)
• Factor or Methane/NG=>CO2 is 1/3 (Generator)
• Factor for Petroleum=>Methane is 2/3 (Cooking)
• Factor for CO2=>Water is 0.222 (Petroleum=>Methane=>Water)
• Factor for Water=>Petroleum=>Methane=>Water is broken (3.333*2/3*2/3= >1 + CO2) so it is never taken into consideration
• Factor PO2=>O2 is 0.9 (Deodorizer)
• Factor Slime=>Algae=>O2 is 0.3 (Distillery+Deoxydizer) 
• Factor Slime=>Water is 2/3 (Distillery) 
• Factor Algae=>O2 is 0.91 (Deoxydizer) 

 

An Irrelevant Note:

Spoiler

It was actually quite enjoyable and it also serves to inform myself~

[Carnis]

1 hour ago, SakuraKoi said:

So, after processing, you get...

• (For Solid) 1782kg O2 and 74kg Hydrogen OR 666kg Water and 1190kg O2
• (For Liquid) 6666kg Petroleum OR 224kg Hydrogen and 1776kg Oxygen
• (For Gas) 500kg Petroleum and 900kg O2 OR 222kg Water and 900kg O2 OR 22kg Hydrogen and 1098 kg O2

For 900kg Hydrogen and 677kg Oxygen OR 1700kg Petroleum and 1278kg O2

So you can turn 1700kg petroleum + 1278 liquid Oxygen into 2000kg polluted water.

Then you can turn this polluted water into 1770kg Oxygen.

So you gain 500kg Oxygen from 1700 kg petroleum. Whereas by boiling to methane directly, you would gain 2/3 x 1700kg polluted water or around 1000kg, but you would not waste 1278kg liquid Oxygen.

*

My conclusion: space cannot uphold duplicants with Oxygen since space industry upgrade.

[psusi]

11 hours ago, KittenIsAGeek said:

There are several ways to get more water. 

1. Melt your ice biomes (but don't dig!)
2. Run your nat-gas generators continually.  This may involve some tricks like the crude to sour gas boiler systems -- using the refineries aren't water positive.  Also you'll get more water per unit crude if you go nat gas instead of petrol.
3. Avoid wasting water.  This includes: Cooking mealworms or mushbars, growing thimblereed in hydroponics, growing bristlebloom as a food source OTHER than berry sludge
4. On that note, Research uses a LOT of water.  If you're short on water, stop doing research for a bit and try to find some more sources.
5. Don't vent your water into space.. I know, the steam rocket needs water to run, but that's the ONLY time you should be losing water (including polluted water) to space.
6. Supplement your oxygen supply with algae terrariums. A total loss of 9.67g/s of water for 40g/s (44 under a light) of oxygen is 4.5g/s of oxygen per 1g/s of water compared with 0.888g/s oxygen per 1g/s of water making it 5 times more efficient.  Yes, you have to empty the polluted water bottles and use a sieve, but every gram of water counts when you're trying to go sustainable.
7. Lavatories, not outhouses.  Every time your dupe does his business on the throne, you'll gain a little extra something in your polluted water pool.  Outhouses don't generate any water -- and the amount of water provided by 40 dupes using latrines actually adds up.  With 10 dupes (two of which have Diver's Lungs and two have small bladder) you can provide a a good portion of their oxygen needs just from the excess water off the latrines.

 

1. Not sustainable
2. So doing the whole crazy use lava to boil oil and then condence the sour gas thing is the only way to get more water?  That's a hell of a bother.  How much more water can you get that way?
3. Been off of mealworm since like cycle 80.  Never used mushbars or grown thimblereed, and only tried bristleblossom for a short while.
4. Been done with research for a *long* time.  Again, we're talking about sustainability here, not short term
5. Not even sure why you'd need to mention that; it's a no brainer and you have to go out of your way to do it anyhow
6. I hadn't considered this one since it is so dupe labor intensive. I'm still not sure it is actually viable since you would have to have like a dozen of them to get very much oxygen and that would take up most of the time of something like 4 dupes.
7. I tried running the electrolyzer just from the toilet water a few hundred cycles ago and it wasn't sustainable, which is why I set up the AETN and started using the water from the steam vent.  After a few hundred cycles I was starting to get a buildup of polluted water so I used it to set up a coolant loop all around the base being cooled by an aquatuner in petrol with a heat exchanger to the steam turbine.  It just seems like it takes hundreds of cycles for this to make much water.

10 hours ago, Neotuck said:

how would you keep up with the dirt?

for 52 sleet wheat you would need 433g dirt per second

that's like having almost 5 compost piles working non stop

where do you plan to get all the compostables to make that kind of dirt?

Good point, so you're back to having to feed people from bristle berries, which use even more water.

10 hours ago, Mr.Trueba said:

@psusi

What are you doing to have not enough water?

I always have between 18-24 dupes and water for like easily 50 more.

Do you have the save file? I can help if I ser what you are doing. (:

I'll upload it tonight.  The only thing I'm using the water on is two electrolyzers, which makes sense since according to the vent calculator, it's only enough for 1.7 electrolyzers.

7 hours ago, Fischer_L said:

Also, as now you can recharge vascilators, you can have deep diver's lung on all your dupes, which cut their oxygen (read water for electrolyzer) in half. But it can take a very long time...

Wait, how do you do that?

7 hours ago, Fischer_L said:

If you preserve wild plants you can easilly support 10+ dupes, wich also cuts water consumption.

I do have a ton of wild pinchappeper that I frequently have to compost to keep it from filling all of my ration boxes.  I don't seem to have much else.  Map only seems to have two small cold biomes with a few wild sleet wheat in them. I guess I could try opening those up and collecting them.

5 hours ago, Carnis said:

If your geyser produces on average 2kg/s this should alone support 18-20 duplicant. If your geysers have high output/second (way over 7kg/s), then you must get tempshift diamond plates around the geyser & make sure your Steam condenses quickly. Otherwise, your Steam might overpressure every now & then losing production.

The rather monster vent I have only supports 1.7 electrolyzers, which will only support 10.2 dupes, so I think you're a little off there.  Also spamming tempshift plates doesn't help since they don't exchange heat with each other; only the air around them.  And since you should only have steam in there, they can only let the steam exchange heat with the other steam, which doesn't do any good.  You just need a big loop of radiant heat pipes.

3 hours ago, clickrush said:

The big game changer here is the material that increases the overheat temperature of buildings by 900°C. This means you can create an infinite loop of cooking oil and get water and power out of it.

Ahh, so the new space material lets you cook oil with an aquatuner?  Guess I need to get on that space exploration then.

2 hours ago, ToiDiaeRaRIsuOy said:

He also mentioned a cool steam vent he has to dig out. If that steam vent is actually one covered by materials (instead of tiles sitting around it), it means he definitely has 1 more cool steam vent somwhere on the map.

The one steam vent I've been using was naturally open.  The other one I spoke of is buried and I just haven't dug it out yet because I didn't want to deal with the heat.  Now that I have a steam turbine I think I'll dig it out.  Those are the only two water producing geysers on the map.  The rest are: 2! gold volcanoes, a chlorine vent, and a hot po2 vent, and one ng vent.

Ohh, and I forgot I guess I am also using the polluted water from the toilet to make fertilizer.

[0xFADE]

Dupes do produce water through toilets.  I don't know if they produce more than they consume through an electrolyzer but having small dupe counts is likely more of a handycap.

Small bladder is a great negative trait.

[ToiDiaeRaRIsuOy]

5 minutes ago, psusi said:

The one steam vent I've been using was naturally open.  The other one I spoke of is buried and I just haven't dug it out yet because I didn't want to deal with the heat.  Now that I have a steam turbine I think I'll dig it out.  Those are the only two water producing geysers on the map.  The rest are: 2! gold volcanoes, a chlorine vent, and a hot po2 vent, and one ng vent.

Ohh, and I forgot I guess I am also using the polluted water from the toilet to make fertilizer.

Hmm, I think you did miss one cool steam geyser unless I missed out on a change. Somebody correct me if I am wrong, but normally you have 4 unburied steam geysers: 2 cool steam geysers and either 2 natural gas geysers or 1 natural gas geyser and one chlorine geyser. Extra cool steam geysers can be encountered, but those are buried.

[psusi]

17 minutes ago, ToiDiaeRaRIsuOy said:

Hmm, I think you did miss one cool steam geyser unless I missed out on a change. Somebody correct me if I am wrong, but normally you have 4 unburied steam geysers: 2 cool steam geysers and either 2 natural gas geysers or 1 natural gas geyser and one chlorine geyser. Extra cool steam geysers can be encountered, but those are buried.

I'm pretty sure you only get 2 steam geysers, which may be buried or not.  I've at least never seen or heard of more than 2, and never seen more than one that was naturally open.  In fact, you may always have one that is naturally open.

[ToiDiaeRaRIsuOy]

7 minutes ago, psusi said:

I'm pretty sure you only get 2 steam geysers, which may be buried or not.  I've at least never seen or heard of more than 2, and never seen more than one that was naturally open.  In fact, you may always have one that is naturally open.

You can get more, I am sure of that. You always get 2, but depending on the seed generated it can be more. I had that happening for me atleast once, with 2 unburied cool steam geysers (vents) (as usual) and one actually buried. I really do believe in your case there has to be a third cool steam geyser. If you want, pass me the save game and I'll check it for you.

The 2 cool steam geysers that spawn for certain are also always unburied (unless for RNG issues or regolith burying it).

[Fischer_L]

6 minutes ago, psusi said:

I'm pretty sure you only get 2 steam geysers, which may be buried or not.  I've at least never seen or heard of more than 2, and never seen more than one that was naturally open.  In fact, you may always have one that is naturally open.

Cold steam geyser may be one of random ones. I for example have 3 cold steam geayser at current game.

[Neotuck]

@psusi you can still try sleet wheat farming you just have to do some extra steps for the dirt

For example you can trade up with mushrooms

If you have a sustainable mushroom farm (morb and puft ranching) you can store them in PO to let them rot 

Then compost the rot piles

22 minutes ago, psusi said:

I'm pretty sure you only get 2 steam geysers, which may be buried or not.  I've at least never seen or heard of more than 2, and never seen more than one that was naturally open.  In fact, you may always have one that is naturally open.

Every map is guaranteed 4 vents unburied.

2 cool steam

1 natural gas

1 natural gas or chlorine (50:50 chance)

Sometimes a POI will overlap one of these vents perventing them from fully spawning

But buried vents can be anything, including extra cool steam vents!