The summer season over, 3 teams of miners dive under the ice to dredge gold on the floor of the Bering Sea. Two dredge teams struggle to winterize their operations, train their crews, and get the gold. But one new, scrappy crew of friends hits pay dirt.

Shamrocks electrical fire forces a diver's emergency ascent. The Clark's rookie ice divers gasp for air. The Lazy Gators Joe finds a huge picker, but their operation grinds to a halt when an accidentally sucked up boulder clogs the hose.

Halfway through the winter dredging season, tempers flare on The Clark. The Lazy Gators do a perilous freedive to try and recapture their only breathing apparatus, tangled underwater in a buoy. A new Shamrock diver tests his own nerve and Shawn's patience.

Winter is on its way out. Shamrock Phil gets one last chance. Clark's Zeke gets pinned up under the ice when he loses his weight belt. A Lazy Gator tender nods off, unaware of diver Jesse's distress call when his hose gets caught on an ice chandelier.

With the winter dredging season coming to a close, the crews scramble for one more dive before the cracking shifting ice sinks their operation or worse, traps a miner down below. The Clark's Zeke loses his weight belt and is pinned up underneath the ice.

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In Nome, gold fever is on the rise as the fleet races to find fortune before season's end. One miner turns treacherous by leaking valuable information to the competition. Zeke Tenhoff battles nitrogen poisoning and a toxic partnership, while Emily Riedel suspects her "Dragon Slayer" maybe sinking the business.

The tides are turning. As competition continues to build throughout the fleet, a turf war has started on the tomcod claim. With the season coming to a close friendships have crumbled and relationships are near collapse, and it’s all for the lure of gold.

Nome, Alaska - With temperatures rising and the Bering Sea melting, time is running out for the fleet of gold dredgers. As the ice begins to fracture, one team sees their dream of getting on the gold float out to sea.

The dangers of working under the ice are becoming glaringly apparent to the fleet's greenhorns and veterans. Zeke and Glen move to an area of deep sea and become concerned with nitrogen poisoning. On the Shamrock, Cody Moen gets a little too big for his britches.

The hard reality of the winter season begins to set in. Partnerships become strained as tempers and egos flare. On the Miss Nomer, Glen LeBaron gripes and Zeke Tenhoff faces the judge. On the Reaper, a discussion about money turns ugly. Emily Riedel snaps over frozen equipment, and on The Wild Ranger, Jason starts to rub everyone the wrong way.

It's getting late in the ice mining season, and the challenges of finding gold are wearing on the miners. Vernon Adkison has a heated confrontation with a crew member. The Kellys welcome a new diver with potentially fatal consequences. Emily Riedel faces her demons, while the Miss Nomer crew has conflicting gold-finding strategies.

The Bering Sea ice shelf begins to break up, putting the dredges at risk; the fleet scrambles for their last pans of gold.

Nome, Alaska. Miners risk their lives diving below the ice on the frozen Bering Sea for a fortune in gold. While one miner nearly loses his life, another hits his biggest payday ever.