I was wondering about the effects of the collapse of the Bosporus on the Red Sea.
I think a likely scenario would be a tropical system holding together enough to rain out in the Zagros Mountains during an already wet year. One to three days of torrential rain, and the truly epic flooding lost nothing in the re-telling. I believe there is evidence of extreme flooding in that area ~6,000 years ago.
Gibralter did not collapse, the low land between Gibralter and Africa was overflooded and scoured away. While something severe appears to have happened regarding the Black Sea, the Persian Gulf is more likely, especially given that the Jews were taken away to Babylon around 500 bce, where stories from the Persian Gulf may have gone into their thinking and bible writing. Graham Hancock is a good source for theories on ruins found Underwater. Here is a very long link to various maps I promised to look for. It includes the map Fred Nerks kindly posted.