Check out this article arguing that ancient humans reached some islands in the Mediterranean sea as long ago as 450,000 years, by boat, not on foot. If this is true, those humans were not modern homo sapiens but homo erectus, suggesting that hominids became capable sailors hundreds of thousands of years ago. If this is true (and I believe it is) then all theories about human migration need to fully explore the notion humans sailed the coast and among islands, out of sight of land, just as often, if not more often, than undertaking long journeys over land. This makes sense, if you think about it, because during these times there were many periods when great ice sheets covered the land, not to mention all the enormous meat eating predators who were, then, the apex predators – short face bear, dire wolf, cats…..
Always nice to find a reader who enjoys the tale….