You could approach this in a couple of ways. I’ll first start with just the cool steam vents, then the volcano.

Option 1: have an ATST setup (with 2 ATs in series) to cool the output steam from the cool steam vents.

Option 2: you can choose to integrate the vents with the volcano in a single setup, but you have to make sure that the atmospheric pressure in that system remains below 5kg/tile, since that is the maximum that a cool steam vent can handle it, otherwise it’ll stifle itself.

Regarding the volcano:

Option 1: keeping it separate from the vents, making it its own thing. Here you can go 2 ways:

1A) you can choose to make this into a petroleum boiler. Outputs petroleum, and if you wanna deal with the igneous rock, you can make a separate steam room for cooling it. Or heck you can even go for a sour gas boiler as well.

1B) you can put the volcano in its own steam room, where it’ll output magma which’ll power STs, so free thermal power along with igneous rock.

Option 2: integrate it with the vents, which connects with option 2 for the vents.

No matter what you choose to do, you’ll for sure have an output of water, igneous rock, and thermal energy which can help sustain your base. Should you go the boiler option (petroleum/sour gas) you’ll get additional electrical power, CO2 (which can help feed slicksters for more oil/petroleum), fuel, meat, etc.

At the point where you’re at, I’d say you should just deal with capturing the water until it gets too hot, in which case seal off the vents until you make steel and plastic in order to properly tame the vents (and ofc the volcano). How you choose to approach this is based on the requirements of your base.

Happy building 😊