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Producer Kathryn Jeffs and Orca Scientist John Durban explain how biologists track killer whales in Antarctica using satellite tags. This allowed the Frozen Planet film crew to pinpoint the location of the orcas.

A migration of eider ducks interrupts an assistant producer's report to camera that the first shoot of Frozen Planet is "beginning to look like a failure". He takes off with a cameraman to film spectacular footage of 500,000 eiders in the Arctic.

Rich plays the cagey trader when a customer wants to make an even swap with a Civil War sword and knife for a Henry Rifle.

Thanks to the largest solar radiation storm since 2003, beautiful aurorae have been popping up across the globe. Martin Berman talks to Discovery News Space Producer Ian O'Neill to understand how the aurora borealis and australis are created.

A Frozen Planet cameraman shares his surprising discovery about polar bears on the southern shores of Hudson Bay. Though mainly carnivores, the polar bears here also eat berries and grass.

Multiple videos of bioluminescent waves off the coast of California have us wondering: What kind of otherworldly phenomenon is this? To find out, Jorge Ribas talks to a marine biologist.

Cameraman Mark Smith is filming a 20-foot polar bear right outside his front door. The polar bear more or less falls asleep in the front garden during a blizzard.

After weeks of prep work, Dakota Fred's secret weapon for the gold mining season arrives at Porcupine Creek.

Field Producer Jason Roberts and Cameraman Mark Smith crawl into a polar bear's den in the Arctic. Nervous that the bear will return, they bravely take a tour of the den, lined with icy polar bear hairs and scratched with claw marks.

A true American cowboy requests that the crew of Gunsmoke create a custom Winchester Yellow Boy.

Watch as this newborn polar bear come into the world.

It's the last day of the 5 week Army Sniper School course. These candidates have only two shots to hit their target. Hit it and they earn their sniper tab. Miss it, and they're headed home.

Cameraman Mark Smith films a young Artic wolf approaching his filming location. The wolf tries to steal some of Mark's belongings at one point. He's fearful of Mark, but is just looking for scraps.

When the derocker overwhelms the single sluice box with too much water, Fred quickly adds a second sluice to slow down the flow so gold will drop.

This SWCC candidate attempts to redeem himself from failing the in-water test from earlier in the training course.

Check out the best Todd moments from season 2 of Gold Rush.

James McDivitt, a NASA astronaut and engineer in the 1960's, reported he saw and filmed a strange object in space. Is there a logical explanation or was there really something out there?

An eccentric gun collector challenges Rich and his team to build a primitive hand cannon from scratch.

Jack reveals the final gold count for the second season of the Hoffman crew's mining.

A large wolf comes trotting across kilometers of tundra to come face to face with a Frozen Planet cameraman. The wolf gets to within 10 meters, and all the cameraman has to record the encounter is a point-and-shoot.

Rich goes over his plan to build slightly modernized 10-barrel .45-cal volley gun that will really impress Gunsmoke's latest customer.

Rock star and gun enthusiast Ted Nugent is in town for a concert so he decides drop in on Will and Red Jacket for some all-American gun and guitar fun.

A cameraman is filming in a cramped hide on a frozen bog in Finland, where male black grouse come to display and fight for females. The birds spend a long time hopping to and fro before they attack. A special camera slows down the action.

NASA Scientist Pascal Lee reports from a remote, rocky island in the Canadian High Arctic. Devon Island is one of the most Mars-like and moon-like places on Earth. There are craters, canyons and gullies here that mimic the landscapes of the moon and Mars.

April 27, 2011-A giant tornado moves through parts of Mississippi and Alabama, leaving destruction in its wake.