I'm not a one-trick horse.

I would travel down to Hell and wrestle a film away from the devil if it was necessary.

If the part is really good of course I would like to do it.

My non-fiction films are pretty much fiction, or at least close... It's all "movies" for me. I never have searched for a subject. They always just come along. They never come by way of decision-making. They just haunt me. I can't get rid of them. I did not invite them.

When I say tourism is sin and traveling on foot is virtue, it's condensed into a dictum. It's much more complex than that, but let's face it, for me, my experience, the world reveals itself to those that travel on foot. You understand the world in a much deeper level. And it does good to anyone who makes film.

You have to realize that, about 20,000 years ago, there was a cataclysmic event when an entire rock face collapsed and sealed off the cave. It's a completely preserved time capsule. You've got tracks of cave bears that look like they were left yesterday, and you've got the footprint of a boy who was probably eight years old next to the footprint of a wolf.

The wonderful thing is that Clive [Oppenheimer ] insisted on training his camera - his private camera - on me at one point. We were discussing things such as how to avoid certain dangers, while reflecting on a volcano that had threatened to explode 40 years ago.