The whole expansion of civilization from Mesopotamia! Perhaps very separate major culture(s) altogether! We have tons of evidence from all those civilizations that were inland and safe from rising sea, but to see Egyptian levels of technological know-how from other Mediterranean cultures shows a much more dynamic and active region! It's exciting to think of how many cultures could have participated only to be washed away. Even during the rise of Rome we hear of numerous, mysterious and powerful seafaring peoples that played big parts in that particular bit of history. To think that similar cultures were possibly even bigger players during early the era of Egypt is just so fascinating and could certainly redefine the way we look at Egyptian and Mesopotamian texts from the early bronze age :O

I'm no expert, I just love that early bit of human history and have always found the mysterious shoreline peoples of the Mediterranean to be some of the most fascinating characters ever! Were they pirates that abducted Egyptian artisans? Were they migrant/rogue Sumerians/Egyptians? Were they major trade partners that acquired the technology through gradual exposure?

What if they had their own technologically advanced culture? WHAT IF THEY INTRODUCED TECHNOLOGY SUCH AS BOATS TO EGYPT AND SUMERIA!?! Did they play any kind of significant role in the development of ancient Greek culture as we know it today?

I don't think this will answer any of those questions in any definitive way, but the possibilities seem to be incredible! How many incredible things lay just off the shores of Greece and other areas, washed away in the typical fashion of the region? Surely lots, judging by what we know of the region's history of mysterious coastal peoples :)

Aaaanyway, totally nerded out there and I'm definitely no expert. Just some of the possibilities that came to mind.