National Geographic HD

Fails include an overpass fire, a downed radio telescope and a sinking airport.

Fails include a disastrous shuttle mission, and an unwanted and very expensive airport.

Whistleblower testimony reignites a decades-long fight for transparency.

Commercial pilots come forward about their encounters with UFOs.

Scientists unveil cutting-edge technology helping in the search for UFOs.

People talk about close encounters they've had with UFO phenomena.

Paid programming.

Join Mike Mezack for a special presentation of the 1776-2026 Enduring Liberty Half Dollars-one-year-only U.S. Mint issues honoring America's 250th Anniversary, including rare rolls and certified MS67 collectibles.

Regain independence and enjoy greater mobility with the compact design and long-lasting battery of portable oxygen.

Meet the new Shark PowerDetect Upright Vacuum with features like DuoClean Detect Technology, self-cleaning brush roll and odor neutralizing and you will be cleaning faster, smarter and better!

Save thousands on car repairs.

See how one company is changing people's lives by helping them put their tax problems to rest.

Alaskans face danger every day.

Climber Will Gadd wants to be the first to climb the Overhead Hazard route at Helmcken Falls, even if it means risking his own life.

While filming for a sports movie, skier Angel Collinson falls from a 1000-ft mountain in one of the steepest spines of Alaska.

When attempting a first ascent on the tallest unclimbed peak in the Himalayas, legendary climber Conrad Anker has a heart attack.

Alpinist Jimmy Chin is caught in an avalanche no one is supposed to survive.

Justine Dupont prepares to ride big waves, but she has to face down fear and risk.

Gerd Serrasolses reflects on a kayaking mission in which he almost drowned, sharing how it has shaped his approach to balancing risks as a new father.

Kayaking legends Ben Stookesberry and Chris Korbuic have accumulated hundreds of first descents in the most dangerous rapids in the world, but the Lukuga River, in Congo, has left a particular mark on them.

Sarah McNair Landry and her brother Eric share their story of kite-skiing the Northwest Passage in winter only to be hunted by polar bears.

Travis Rice reflects on the avalanche that catapulted him into the unknown and shares how it has shaped his life.

Alpinist Alex Honnold wants to climb huge walls in Morocco without a rope; enhanced.

The villagers of Port Protection are back to paving with good intentions.

Curly shoots a bear; Troy and Sarah struggle with a new water system.

Residents tackle tasks at the height of summer's season of productivity.

All around Port Protection, neighbors lend each other helping hands.

Port Protection's canine community takes center stage.

Curly takes advantage of a break between storms to hunt for deer.

In this enhanced episode, Curly takes aim at a deer, but one shot isn't enough.

In Port Protection, a new generation seeks wisdom from the old guard.

Alaskans in remote areas must have self-reliance to survive.

In this enhanced episode, Curly takes aim at a deer, but one shot isn't enough.