How would an aquatic civilisation forge tools?

One of the first steps in technological is the ability of a civilisation to forge tools* humans achieved this by using fire and creating forges.

There are obviously underwater heat sources but I don't anticipate our sea-folk being able to use the heat from underwater volcanoes any more than we can above ground!

How could an underwater civilisation generate and control the heat required to forge metal as we did above ground?

_{*This question actually started asking how they would build computers but I've got back several steps!}

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How would an aquatic civilisation forge tools?

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