Hypothetically, lets say there was a pretty advanced culture that lived in a valley region where the Black Sea is today.
I suppose you could imagine a mighty deluge could sweep through the valley and very quickly annihilate everything, leaving a lot of displaced people.
Even if it turns out not to be Atlantis it's an interesting thought. No doubt during an Earth-wide cataclysm there will be many "floods", many displaced peoples.
Cheops didn't build shit except a boat. Cheops wrote his name on many great constructions.
These timelines are for the "profane", such as us peasants. What really happened is far more interesting.
The three great pyramids are much older than the shitty imitations and are not tombs.
The best theory I've heard is that they were irrigation water pumps that energetically charged the water, helping facilitate Egypt's great empire. Simultaneously, the surface of the pyramid would have such a high albedo that they would illuminate a huge region even with moonlight. The function of these utilitarian structures would have been lost over time and their purpose relegated to mythology.
Whatever they were they certainly weren't intended/built as tombs
https://www.britannica.com/place/Cyprus/Government-and-society#ref214648
Cyprus looks like one of the sites for some of the most ancient habitation. It's also located in such a place that people from Cyprus have access to many ancient shores.
Aphrodite https://en.wikipedia.org/wiki/Aphrodite
and
Adonis https://en.wikipedia.org/wiki/Adonis are also associated with Cyprus
Phoenicians also had settlements there
https://en.wikipedia.org/wiki/Cyprus
Seems like a post Atlantis site, tied up with Greece and Phoenicia.