It is said that ancient Greeks had great development of their technology such as antigravity.
In the myth about Argo it is said they traveled among the globe(from New York through Antartica, from Pacific through Australia and India where they found the golden fleece) and all that are difficult to be achieved only with a ship and 50 oarsmen.
I don`t know what do you think but as I said before every myth is based on real facts.