The forge is hot, the stone is cold.
What to burn could be my previous suggestion made below my list of ideas, oil
It occurs naturally from seeps on the sea floor
That wasn’t the question: the question was “How do they build the boat to begin with?” because if you didn’t know this: reed rafts won’t work if they are completely wet
And is also highly toxic and too difficultous to handle when in water
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hm- reach out of the water, its not easy but its possible. as for the hot argument- put a blanket or rock between them. yeah oil isnt a good idea.
Their manipulators would still be wet, other than that: We still haven’t discussed how they get the stones to make the forge, or to separate the fire from the raft or how they even get the materials to make the raft
river delta for resources, my original proposal for this had very long armed tentacles, you can leave stuff out to dry. wet rocks arent a good idea, so id say just grab a rock and put it on the raft.
You can’t just make a forge using random rocks you find outside of the water you depend on living, they need to have an easily stackable shape or else it all falls apart
luck. pure luck. its belgiuming stupid, but you need to luck out. Edit: the principal behind trading with land civs is literally luck.
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I agree with Deathwake. Pure luck with these kind of things, while maybe not probable is possible, and we are trying to find ways to make underwater civs realistically possible, not realistically probable.
After all, how probable was it for a ground ape to throw a specific rock into a fire pit (not counting how likely it was for said ape to discover fire in the first place) and have it smelt, and then for that to eventually turn into our modern day metalworking?
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I don’t know, how many years has that ape had fire?
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That is actually very likely, other than that
More probable than the things you are suggesting, other than that I’m pretty sure the only metal that would melt in a fire pit is tin, and one of the first metals recorded to be melted is gold, so they used more advanced fire based technology, not just a fire pit
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Also copper can be softened and hardened by normal fire.
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w8 y not use like biological engines and creatures for it, like a living furnace that you can plop on a hydrothermal vent or something like that???
slime power engines?
NOPE. There is a reason that the meme
Says that the underwater civ can trigger a forum by mentioning hydrothermal vents. That’s just- don’t to death, not gonna work, I remember when I first came across the servers in 2017 or 16 (hundreds of years ago in internet terms) and I didn’t make an account because I was scared I’d mention an underwater civ idea that was famous for being stupid, as my best idea at the time, hydrothermal vents, was already famous for being dumb and overdone. I. Pretty sure it was like that on the old server. Won’t work. And animals would die at metal melty temperatures. You can’t smeltle the meltel if you yourself are utterly smeltled.
but what if…you dont get utterly smeltled
vsauce theme
What if instead of smeltle the meltel, you meltel the smeltle.
wha
w8 that might work, if you use molten rock with high metal concentrations you would be able to cool it down into some metal amalgamation.
We are not talking about earth’s composition but a metal-rich planet with high volcanic and tectonic activity, most likely newly created, or just impacted by a major event.
That’s about as good as using meteoric iron to get passed the bronze age on earth. I.e it don’t work. You can get iron sure (in the analogy this would mean no one debunks this, which is unlikely, I prolly could and I don’t know shit about xenogeovolcanism) but it’s not enough to advance passed the average farmer/soldier using bronze. And um- calling molten metal in water… There’s a reason no one does that on earth. Maybe if you could get an oil spill to spill into a techtonically active area? But I think crude oil floats so that might 
stuff over.
how would u shape it though, i was thinking that the magma of this planet would be a highly concentrated metal like iron and that you could take it// pipe it out of a lava tube into a refinery under water, that had a lot of molds were they would soidify