Unchained Reaction: Missing Link Reveal
With only one day left, the teams scramble to finish their builds and a curveball from Adam and Jamie complicates things.
Most Watched in Engineering
Sons of Guns: Desert AR15 Debut
Before General Darden arrives for the big test, Will lets one of the nuclear facility security contractors try out the Desert AR15 assault rifle on a couple of targets.
Bering Sea Gold: Honey Hole Hunt
After the Clark's first hot spot is tapped out, Zeke and Emily head out to find a new honey hole.
With the freeze closing in fast, Todd gets Thurber to sample the spillover dirt from cut #3 that has to be delicately removed from underneath the wash plant.
Gold Rush: Quartz Creek Gold Total
Jack Hoffman reveals the final season gold count to the Quartz Creek mining crew.
Bering Sea Gold: Signals Crossed
Wild Ranger greenhorn Jason Walker gets confused about diving signals and pulls Capt. Scott up out of the water when he should be letting him drop to the bottom.
In Barrow, pilot Luck Hickerson struggles to fit four planes in a hangar designed to only fit three.
After purchasing a new piece of equipment, Parker Schnabel's mine is working quite efficiently until his excavator suddenly breaks down and halts all operations.
American Guns: Top Dollar Hunting Rifles
An accomplished big game hunter shows Rich and Kurt a collection of superb European hunting rifles with the hope of making a sale.
Bering Sea Gold: Bar Fight Stabbing
After a big Christine Rose pay day, Shawn and Cody go to grab a few drinks but run into a jealous knife-wielding thug who starts a fight.
Sons of Guns: Hogzilla to Godzilla
Will and Kris meet up with Brandon and some friends to test out the hog gun. From an airboat, they spot a hog and put the muscled up, silenced, night stalking AR to use.
Off his game with bad cold, Dustin Hurt accidentally drops a huge boulder on the wash plant that knocks it out of action.
Material Marvels: Shape-memory Alloys
Shape-memory alloys are used in everything from space exploration to dentistry -- but how could metal have a memory? Tune in as Dr. Ainissa G. Ramirez, Associate Professor of Mechanical Engineering & Materials Science at Yale, explains. www.seas.yale.edu
Recent Videos in Engineering
How can a Toyota Tundra with a 10,000-pound towing capacity pull a 300,000 pound space shuttle? Scott Benjamin of CarStuff delves into the physics at play during the space shuttle's final journey to the California Science Center in Los Angeles.
Sons of Guns: Jesse James Lets Loose
After Will Hayden receives a surprise visit from Jesse James, he gives him a chance to shoot many guns from the Red Jacket collection in the range.
Sons of Guns: Jesse James Surprise
Just when Will and his team thought it was another day at the shop, they receive a surprise visit from Jesse James.
The Red Jacket crew works on building an aluminum Browning automatic rifle for Jesse James. During the build, Jesse James gives Flem a quick lesson in welding.
Sons of Guns: Custom BAR Build
Will Hayden runs his Red Jacket crew - including Vince - through the plans to customize a BAR for Jesse James.
Sons of Guns: First Submachine Gun
A rare gun collector brings in a German Schmeisser MP 28, a variation of the first infantry submachine introduced at the end of World War I.
Sons of Guns: Jesse Opens Fire
Jesse James takes his new customized Red Jacket-style BAR out for a firepower spin.
Bering Sea Gold: Dredger Funnies
Have some fun with a few of our favorite Bering Sea Gold outtakes.
Bering Sea Gold: Don't Call Me A Thief
Scott Meisterheim gives After The Dredge host Thom Beers his thoughts on the fight with Wild Ranger owner Vern Adkinson.
Bering Sea Gold: What Is Gold?
After The Dredge host Thom Beers brings in UC Santa Barbara scientist Doug Fischer to help explain exactly what gold is and where it originates.
Bering Sea Gold: Zeke Drops A Bombshell
Seemingly out of nowhere, Zeke accuses the Sluicey crew of making back-handed deals.
Bering Sea Gold: Cosmic Gold Origins
Our gold science expert Doug Fischer shares more about where gold came from billions of years ago.