Well I don’t think it’d help their metal quests much…
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It proves you don’t need smelted metal diodes to perform electrolysis. Also, the hydrogen and oxygen could be useful, if it could be collected/harnessed. Then there is the fact that the ore causing this is basically a series of 0.9 Volt batteries. Grant it, there aren’t too many things that can be run off of that voltage, but still, there is probably something that they could be used for. Also, the denser oxygen in those patches would likely be good for their health.
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Would a civ at those depths still be able to see?
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Bioluminescence. Or they could just have other senses.
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Isn’t biolum pretty bad for lighing up stuff for a creature to see?
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In the dark, it is really easy to see a bioluminescent creature. Or a path lined with bioluminescent plants or minerals. And if there is something in between you and the bioluminescent source, the fact there is darkness where you know there should be light tells you something else is there (like seeing a shadow). It is not a flashlight, but properly utilized, it would help with vision.
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How come would there be plants in the dark?
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Some algae grow over 270 meters down . There are also bioluminescent fungi. Then there is the fact that bioluminescent fungi will glow up to 2 days after being picked. I assume the same is true of algae. Also, the 2 days is based on “drying out”, which wouldn’t happen under water, so they could potentially glow a lot longer after being picked.