Bibor
Doomsday Machine
The Egyptians used not galley, but rather a smaller ship made of bamboo to reach the shores of South America. It has been proved by the modern expeditions Ra I and RA II.
South Americans used a similar vessel (but made of wood that contains rubber i think) to reach Polynesia (well far from SAmerica). Proved also by modern expedition Kon-Tiki on which they used *no* modern stuff like charts and sextant and sailed a copy of the boat. It took them around 100 days to do so (not very much by CIV standards).
So why is this exploit? From game terms, like getting premature contacts with other civs so you can trade tech faster and better, yes. But noone says your ship is going to make it anyway. You can send a dozen galleys (that would be many many useful production shields wasted).
EDIT: I found a link as proof: http://www.museumsnett.no/kon-tiki/Expeditions/
South Americans used a similar vessel (but made of wood that contains rubber i think) to reach Polynesia (well far from SAmerica). Proved also by modern expedition Kon-Tiki on which they used *no* modern stuff like charts and sextant and sailed a copy of the boat. It took them around 100 days to do so (not very much by CIV standards).
So why is this exploit? From game terms, like getting premature contacts with other civs so you can trade tech faster and better, yes. But noone says your ship is going to make it anyway. You can send a dozen galleys (that would be many many useful production shields wasted).
EDIT: I found a link as proof: http://www.museumsnett.no/kon-tiki/Expeditions/