In the Season 3 premiere, Spencer and Eugene brave freezing water and other tough terrain as they search for a legendary lost gold mine with their neighbor Cowboy. But before their journey begins, they build their own dredger with a water pump and hoses.
Eugene needs half a pound of ginseng to trade for his down payment on a truck. He also needs to dry the herb, so he and Spencer concoct a waterwheel-powered dehydrator out of junk, while keeping their eyes peeled for a troublesome poacher who's getting in their way.
Eugene and Spencer are hoping to gain access to the local hunt club's private land in return for a tree stand, which they have one day to build out of hand-milled lumber, homemade birch oil and abandoned pigsty roofing.
The guys try to capture a squirrel, a task that requires camouflage suits and backwoods blowguns with spider venom-tipped darts. They do this in order to keep a promise to their friend who wants a girlfriend for his pet rodent.
Eugene finds an abandoned dynamite cabinet made out of solid steel, which he decides to convert into a bomb shelter, but first he and Spencer must create a water filtration system and figure out how to bury the structure so that it remains hidden.
Word gets to Spencer that the fire chief wants to equip his squad with tools made on Cold Mountain, so he and Eugene get to work trying to win the contract by forging a bushwhacking, brush-clearing machete from a steel saw blade they salvaged from a big scrapyard.
The guys help the residents of Cold Mountain survive a heat wave. Included: They build an air conditioner for Mama Gene's car out of an old fan and wet rags. Also: The house-sized chiller they craft using deadly materials threatens to blow up in their faces.
The guys help a homebound Mama Gene, who broke her foot after stepping into a gopher hole, celebrate July 4th without leaving her porch when they build her a hillbilly-ninja-rocket wheel, plus a flame-roasting bug zapper to protect her from pesky insects.
Spencer and Eugene must pull an all-nighter in order to fulfill the request of a collector who wants 15 knives forged in two days. Also: They construct a water wheel to power a homemade grinder and electric light, which they'll need to get the job done.