Why is it that scuba divers and surfers are some of the strongest advocates of ocean conservation? Because they've spent time in and around the ocean, and they've personally seen the beauty, the fragility, and even the degradation of our planet's blue heart.

I try to lead a pretty active lifestyle. My biggest hobby is traveling with my family. I love to travel to new places and try crazy things. I'm a bit of a daredevil, so I have done things like zip lining, parasailing, scuba diving, and reverse bungee jumping!

Something I like to do a lot is just sit by water when there's a current and just stare into the water. I don't fish, I don't hunt, I don't scuba, I don't spear, don't boat, don't play basketball or football - I excel at staring into space. I'm really good at that.

When I'm looking for Zen and I'm not saying this facetiously at all - I would really rather surf, scuba dive, or fly my plane. And, when I feel tension about the grind of work, it's not getting the money to make films versus making films that constitutes the grind, it's all this stuff.

I do a lot of speaking about energy and environment. But that's more a second job than a hobby. Hobby-wise, I love the outdoors - hiking, biking, kayaking, swimming, scuba diving. Because I spend almost all of my life in front of a screen, time in nature is especially important, I think.

While scuba diving off the British Virgin Islands about 25 years ago, our boat's anchor got stuck. I dived down to release it, but I got separated from the boat and was stranded as it sped away. I had to swim for an hour to the nearest island with all my scuba kit on before I was rescued.

I seek out things that terrify me, like an improv class. I'm terrified of sharks, but I scuba dive. I'm not good at auditioning, but I force myself to do it all the time. I've never met anybody who is fearless, but the more you push against your own boundaries, the easier it becomes to push.

I've got my advanced scuba diving license. I'm playing tennis and exercising. I ride my bike everywhere. I've been finding new things. I've been more creative in music and doing different videos. And just meeting different people and being around and present. I'm wonderful when I'm just on nothing.

Growing up in Alaska, they don't really teach you to swim there. I learned to swim just a few summers ago with Olympic gold medalist Amanda Beard. She did great, and right after that I went to get scuba certified. I had fun with it. I didn't really get scared, but some people thought that was a risk.

I know it's odd. But when I was getting scuba certified, it was explained very early on that you never get to just strap on a tank and jump into the ocean. You have to know how deep you're going, and the deeper you go, the less amount of time you stay down there - and it takes longer to get to the surface.

The thing I remember most about space is the view from the spacewalk. When I was inside the space shuttle and looking through the window, you can see the earth and the stars, and it's very beautiful, but it's like looking at an aquarium, sort of. When you go outside and spacewalk, you become a scuba diver.

So many of the pleasures of recreational scuba diving don't exist for the deep wreck diver. It's not beautiful scenery for the most part; in fact, it's usually very dark. It's physically burdensome. These guys carry almost two hundred pounds of equipment, and should any of that equipment fail, they risk death.

My grandfather was Jacques Cousteau, a pioneer of ocean exploration and the co-inventor of scuba diving. Back in the 1940s when he tested out his invention which allowed humans to swim freely in the ocean with a portable air source for the first time in history, very little of the ocean had been explored let alone captured on film.

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