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ivan_at_hnon 25,000-Year-Old Structure Built of the Bones of 60 Mammoths

I don't think so. This finding is just one piece of the big paleolithic complex, which is systematically excavated for a century. Human remains from the complex cover almost twenty thousand years.

https://en.wikipedia.org/wiki/Kostyonki-Borshchyovo_archaeol...

ivan_at_hnon Exceptionally Preserved Ancient Ships Discovered in the Black Sea

I think that it is because most archaeologists tend to explore places where they live and where they know something about. And where they can get funding. Like Mediterranean sea. Underwater archaeology is very expensive. There are guys who explore shipwrecks to sale treasures from them, you can look at their financial reports here (it is not easy for them): http://www.odysseymarine.com/

ivan_at_hnon Exceptionally Preserved Ancient Ships Discovered in the Black Sea

"The wrecks survive in such good condition because at a certain depth the Black Sea has anoxic, or oxygen-free, conditions preventing decay. Many of the ships sit at the bottom of the sea with their masts upright, their rudders still at the ready and their cargo bays full of untouched goods."

As far as I know, this oxygen-free water layer below approximately 150 meters from the surface makes Black Sea unique. Virtually anything drowned in it from the beginning of marine history is in perfect condition. If I was a beginner archaeologist who dreams of big discoveries then I'd look at the Black Sea in the first place.