tech level? Are we talking, alternate earth where there was never major construction there, and everybody's just moved uphill a bit? Someone trying to scavenge copper from increasingly deep water? Alien archeologists? Slow resumption of trade in wooden sailing vessels?
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tech level? Are we talking, alternate earth where there was never major construction there, and everybody's just moved uphill a bit? Someone trying to scavenge copper from increasingly deep water? Alien archeologists? Slow resumption of trade in wooden sailing vessels?