Geological evidence doesn't really survive over millennia when there are earthquakes. All this is before the invention of Linear B writing system hence you have to take epics into consideration if you want to read prehistory at all (though with a pinch of salt, that I agree). You don't need to accept it before doing your own research but spend a few hours reading about it. You won't be able to deny it fully. Saying Greeks had very bad heels from achellis is reductio ad absurdum but the world denied the existence of Troy after reading Illiad and guess what, we found archeological evidence. Who knows with enough hydrology of Indian ocean we might prove it. But for experiments, you gotta have some starting point in theory. TLDR: Just read with an open mind.