You have to be very prudent with what you are doing and what sort of tools you are utilizing. Drones have become a wonderful new tool in filmmaking.

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 am so used to plunging into the unknown that any other surroundings and form of existence strike me as exotic and unsuitable for human beings.

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.

I live my life outside of the glitz and glamour of the red carpet events, and so you’ll never see me there. I’m never at parties.

Spirit of immersion and curiosity and awe and participation is something which Timothy Treadwell and I have in common.

I think I would be a good villain in a James Bond movie. They were fairly weak, the last half-dozen of villains in James Bond movies were not that convincing.