How Extreme Are You?

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The Universal Pictures film Sanctum, a 3-D film from Executive Producer James Cameron about 15 cave divers trapped by a freak storm, opens this Friday.

To help launch the film, producer Andrew Wight—a long-time collaborator of Cameron's and on whose experience the film is loosely based—has posed a challenging question: How extreme are you? To find out, viewers can go to the Santcum YouTube web site to view a collection of extreme sport clips and rate their extremeness. Your ratings, in turn, determine how extreme you are.

Sanctum has also paired with National Geographic and Facebook to host the Sanctum Extreme Adventure Challenge. Upload a photo and story of your greatest adventure to the Sanctum Facebook page for a chance to win $1,000 cash and a Canon G12 10MP Digital Camera.

Trapped in a network of caves with the entrance blocked and being forced to find another way out? That's pretty extreme. So is this Outside classic of diving in Africa's Bushman's Hole, the third-deepest freshwater cave known to man.

So, how extreme are you?

–Michael Webster