Stats of safety do not calm my nerves. When I'm driving, I feel like I have a fair amount of control over my safety. I can be extra attentive, check my tire pressure, leave space in front of me, choose not to ride a motorcycle, etc. In a plane, ship, train, or a submarine, I have to completely relinquish my control to others. If something dangerous starts to happen, I have little or no control over my fate. I can't steer into the skid or whatever. That is what is troublesome. By the way, I'm sure if submarine travels were as congested as the I-5 in L.A., the safety stats there would plummet.