Availor, nothing to worry about. I'm always easily distracted. That's why I'm all over the forum...
Like Bob's comment to the Journey to the Center of the Earth. That prompted me to look up an old copy of the book I had stashed away somewhere . Nice reading it again. And yes, no reference to vehicles there. Must be something Hollywood film versions added later on. Well, going down there on foot is believable only on novels. Using pointed nose vehicles seems more plausible on film. But in real life, I don't think anyone can do it.
Oh boy, am I distracted now....