Well most of us would take a flight I would say and arrive into London in about 7 hours. Google Maps has another idea I am afraid which I would not take literally! Go on to Google.com and do the following:
1. click on "maps"
2. click on "get directions"
3. type " New York " in the first box (the "from" box)
4. type " London " in the second box (the "to" box)
5. click on "get directions"
6. Read step #24
Yes they are actually asking you to swim the Atlantic!! Best of luck to all that follow these directions.