Google-Mapping NY to Dublin

Ask Google Maps for driving directions from New York to Dublin, Ireland and they'll give them to you, including this step, "Swim across the Atlantic Ocean 3,462 mi." Weirdly, they instruct you to swim to France, drive the Chunnel to England, then take a ferry back to Ireland. Surely there's a more efficient totally impossible route?

Update: Dave sez, "Of course, you'd have to swim about 4.9mph for 29 continuous days to achieve this time. Considering that the worlds fastest swimming records (in a 50-meter race) are just over 5mph... your mileage may vary!"