Drones, at the very least, would not be that hard. They're already developing a solar-powered drone that can stay in the air for years; crossing a few oceans ar

Drones, at the very least, would not be that hard. They're already developing a solar-powered drone that can stay in the air for years; crossing a few oceans are definitely in the realm of possibility. http://www.popsci.com/article/technology/solar-powered-drone-designed-fly-five-years-nonstop http://www.popsci.com/article/technology/solar-powered-drone...