Expedition kayaker Scott Lindgren knocked off first descents of the most remote and dangerous rivers on earth, from the Himalayas to the Sierra. He paddled with an aggro attitude and saw weakness as an unforgivable trait in himself and others. But when a brain tumor started to derail his athletic performance and threaten his life, everything changed.

He surfs sixty-foot waves, performs Hollywood stunts, and can hold his breath underwater for six—six!—minutes. Now he's freediving to tag hammerhead sharks for science.

The son of IMAX king Greg MacGillivray, Shaun MacGillivray has been on film sets from Saudi Arabia to Everest. So what has the crown prince of the giant screen learned from dear old dad? Keep an eye on the tiger, don’t smell the walrus, and never stop working.

Paragliding trips in the Indian Himalayas are deadly, unpredictable...and one of the greatest thrills on earth.

Like many inventors, Graham Hawkes rides the line between revolutionary and cash-strapped dreamer. But if his new "flying" submersible works, he may be the first man to go 36,000 feet below the ocean's surface alone. That's deep.

What's more entertaining than a big-wave contest at Maverick's? The two men fighting over it.

At a Bolivian animal-rehab center, volunteers can adopt a rescued jaguar and take it for daily walks on a leash. Brave and compassionate, or just plain stupid? THAYER WALKER discovers that it may be all three. And he's got the scratch marks to prove it.

If a shark doesn't kill you, shallow-water blackout or a giant propeller might. But the spearfishermen free­diving the oil rigs off Louisiana's coast don't let that get in the way of the hunt for fresh tuna.

A peek under the living roof of San Francisco's newly rebuilt, half–billion–dollar monument to nature

Pro kayaker Berman, 29, made a name for himself by hucking hundred-foot waterfalls. But this fall, he's attempting his most daring feat yet: running for the legislature, as a Democrat in Washington State.

When Keith Stewart opened his Pezula Resort, in Knysna, South Africa, in 2004, he hoped for a flood of guests. Instead, he got a flood. At Christmastime, rain gushed through the chimneys, turning the $20 million resort into a swamp. Things have gone more smoothly since. In the past four…

Think adventure filmmaking sounds glamorous? Then watch THAYER WALKER get schooled on Kilimanjaro.

Karl Stanley is a stubborn, unconventional big talker with some powerful enemies. He's also a fearless mad genius who's reinvented DIY exploration in his homemade submarine. Ready to climb aboard?

Take one desert island, insert one strapping lad, and see how long he survives. That's the recipe for our half-starved, sunburnt castaway, who lived to tell the tale.

Divers do the damnedest things in pursuit of Northern California abalone—like poaching, drowning, and getting gobbled up by great white sharks