I was tempted to vote for travel by car. It feels the safest when I am in it, nice an cozy. But, I know that there are more fatalities in car accidents than by plane travel. However, I don't know all of the statistics, and since a bus is still a motorized driving vehicle, I voted for ship. I don't hear about ship wrecks very often at all, but then they could either not be newsworthy enough for me to know about it or some other expanation. I thought that maybe with newer technology, that boating along on water, even at a good speed (I don't think it comes close to the speed of an airplane, though) might be safer than flying at great speeds through the air at such high altitudes. I could be wrong, though. I am really only guessing.