Some of the most important caves, like Lascaux in the Dordogne region in France, have had to be closed down. There had been too many people allowed in, and they left a mold on the walls that is spreading and which can't really be stopped.

I do whatever pushes me hardest. It's coming at me and I try to... it's like uninvited guest and I have to wrestle them out the door or through the window - get them out and get over with them quickly.

Life in the oceans must be sheer hell. A vast, merciless hell of permanent and immediate danger. So much of a hell that during evolution some species—including man—crawled, fled onto some small continents of solid land, where the Lessons of Darkness continue.

There is a fascination about crime, which is understandable, but hardly anyone talks about the families of victims of violent crime and the devastation that is beyond the victim alone.

When you look at any of my films you will immediately be able to tell this is a [Werner] Herzog film. Even if you didn't have any credits, in two minutes flat you would know.

It was a subject [ volcanoes] that was dormant in me for a long time and it popped up 40 years ago when I made a [short] film on the Caribbean island of Guadeloupe about a volcano that was about to explode and a single farmer refused to leave ["La Soufrière"].

Ambition is to be the fastest runner on this planet, to be the first on the South Pole, which is a grotesque perversion of ambition. It's an ego trip, and I'm not on an ego trip. I don't have ambitions - I have a vision.