I think the cave should be revisited, the holding space is so minute that it's almost not even worth it. At lvl 10 it holds 3k each resource while I have over 500k limestone on hand.

Underground cave
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We'll keep that in mind, it's definitively not the first time we hear this complaint. The Underground cave is not supposed to be a perfect resource safeguard, but I agree that it could be improved.
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Well, I agree that it doesn't need to keep everything safe, but something like 5% of your max. space is not that overpowered, i think.
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I agree with the 5% . It would be nice if you where hit that you could have enough resources to build back up with a little haste
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Maybe, I am just thinking about it, it is better to give a percentage bonus than an absolut number. If you work with something from 1%-5%(depending on the level), de building will indeed be like not worth too much in the beginning and still be very usefull end-game. Or maybe it is too weak in the beggining, although I think it would be more than now, so it could be ok. Not so sure about all the numbers and proportions.
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It's funny that you mention that because the underground cave actually started with a percentage based formula in an earlier beta, but since no one seemed to like that we quickly switched to an absolute number based system
We'll see, we understand the current cave is not ideal either way.
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As I understand it, at present when a city is attacked the maximum of that city's total resources that can be plundered is 40% minus whatever is protected by the cave, so the cave would work pretty well if you went back to percentage based? eg 40% max plunder with a L20 cave would mean maximum plunder of 20% of total res. It's also matters whether food can get plundered or not and what effect that would have.