There was a theory that the Black sea used to be a fresh water lake separated from the Aegean sea by a land barrier in the Bosphorus.
https://en.wikipedia.org/wiki/Black_Sea_deluge_hypothesis
The water level in the Black Sea was 80m or so below the sea level. Around 9000 years ago, the Bosphorus barrier was breached, and salt waters from the Aegean flowed into the Black Sea, leading to a huge inundation and rise in sea levels of many tens of metres in the Black Sea area.
There is good evidence for some kind of inundation (rapid rise of water levels; water scouring; destruction of dwellings etc)
The historical fact (if that is what it is) gave rise to a myth of a god-inspired flood.
However, recent (2009) evidence from Woods Hole Oceanographic Institute (WHOI) (one of the top oceanagraphic research institutes in the world) suggests that the difference in sea levels was 'only' around 40m, so the inundation was less severe than previously thought.
https://www.whoi.edu/oceanus/feature/noahs-not-so-big-flood/
As for Noah bulding an artk to rescue unicorns, dragons and elephants... no. Just ... No.