Sky-high summer temperatures cause miners to search for new strategies.
As summer kicks into gear, Ken and the Myrtle Irene get stuck in the mud. The Kellys are forced to bail out at Fort Davis. Elaine tries to make up for lost time due to Vernon's late start. And Shawn receives word on the fate of the Christine Rose.
Shawn gets his first taste of the shifting seabed. Ken tries a new perspective to find new ground. Kris and Emily each try out greenhorn divers to boost their productivity, but the plan grinds to a halt for one of them.
Shawn fights the shifting tide, and new diver Ben saves Vernon's day.
Tensions fly as Brad leads The Reaper into hostile waters.
Shawn goes for a ride, Kris raids a claim and Vernon loses his patience.
Shawn and Ken push their operations to the brink in a massive storm.
The Myrtle Irene's post-storm fate is revealed and Vernon mines a river.
Shawn confronts his dad for the sake of the family operation.
As summer's end nears, Shawn claws his way closer to the top of the gold count. Emily leaves her unpredictable father to tend on the Eroica. Kris works his new partnership in pursuit of a brighter future. And Ken pushes the repaired Myrtle Irene.
The approach of a season-ending storm tests the severity of Nome's gold fever. Shawn digs in deeper water. Ken pushes the Myrtle to its max. Kris blindly mines an undersea trench. Emily plays chicken with Mother Nature. Elaine proves herself to Vern.
Winter has come -- along with the unpredictable ice in decades.
Only days into the season, a regulator freeze cuts off Shawn's air supply.
A violent arctic storm approaches and Shawn can't quit the gold.
Shawn goes on a marathon dive and Emily takes another shot at TOMCOD gold.
Suffering possible defeat, Kris wrecks his plan and abandons his crew.
The clock ticks as Shawn tries to prove the viability of the TOMCOD.
Shawn fights frozen ground while Kris' plan to beat the cold fizzles out.
Kris finds gold under the ice with fire over head and Emily risks it all.
Shawn pushes his equipment to the edge while others rise from the ashes.
As the miners rush to solid ground before the ice vanishes, Mr. Gold outlasts the fleet to secure TOMCOD. Kris assembles a makeshift operation. Emily rolls the dice on one last dive and Vernon hightails it to land on dangerous ice.