We managed to make very low oxygen environments thousands of years ago, well before we knew what it was, so I can easily imagine them making vacuum or gas filled smelters, or using undersea thermal vents for smelting. There's so much more inertia in water, imagine wearable computing devices based on valves, and using pitot pressure to drive them. (Less educated dolphins being consigned to the swim farms where they push calculators through the water for 10 hours a day, bringing them back to the managers, who tabulate the results...)
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There's so much more inertia in water, imagine wearable computing devices based on valves, and using pitot pressure to drive them.
(Less educated dolphins being consigned to the swim farms where they push calculators through the water for 10 hours a day, bringing them back to the managers, who tabulate the results...)