Reddit reviews The Road to Ubar: Finding the Atlantis of the Sands

A mythological worldwide event whose actual basis is scientifically estimated to have happened somewhere around 5000 BC

http://abcnews.go.com/Technology/evidence-suggests-biblical-great-flood-noahs-time-happened/story?id=17884533

The exact date is never specified in WoD texts or the Book of Nod since the conception and use of calendars was not yet common to societies, but the VTM lore calls the event "The Deluge" and it destroyed 'The First City'

http://whitewolf.wikia.com/wiki/Deluge

http://whitewolf.wikia.com/wiki/First_City

I've used random.org to generate three random end-numbers as a possible date:

5481

The first city in WoD also refers to the myth of the city of 'Ubar' which is sometimes claimed to have been destroyed 3000 years ago (a good book on my bookshelf irregardless):

http://articles.latimes.com/1992-02-05/news/mn-1192_1_lost-city

https://www.amazon.com/Road-Ubar-Finding-Atlantis-Sands/dp/0395957869

http://www.cracked.com/article_19226_the-5-most-extravagant-ways-cities-have-been-wiped-out.html

For parity with WoD, Clapp should be considered incorrect and an alternate known or unknown site should be considered as the true archeological location:

https://en.wikipedia.org/wiki/Atlantis_of_the_Sands#Theories_about_the_location_of_a_lost_city_of_the_sands

Especially of note is that in one of the Gehenna scenarios a party can travel back to The First City where there are statues of 27 different vampire Antediluvians, many more than the VTM clanbook narrators are aware of.