Sig and John chase giant kings as catastrophe forces Jake to abandon ship.
Keith races to locate the Titan Explorer crew and save their ailing vessel.
As a typhoon slams the fleet, Rick stitches a head wound in pitching seas.
A brutal knife injury on the Northwestern leaves Sig scrambling. After one crewman quits, tensions explode on the Confidence until even the co-captain revolts.
In treacherous western waters, Sig and Jake gamble on a daring new fishing strategy. Rick and Sophia attempt a perilous boat-to-boat transfer to save a quarter of a million dollars of crab.
Johnathan's dash to the dock halts as the Coast Guard boards the Time Bandit. Sig seeks a bigger biomass out west and convinces Rick to go to Adak to dig up his father's lost fishing spots.
Ice encapsulates the Northwestern as cultures clash aboard the Wizard.
Jake battles a cracked tank as the norovirus spreads on the Time Bandit.
Sig strikes gold raiding Keith's hot spot, but when a line snarls his wheel, he must call his rival for help. A rogue wave knocks out Rick's electronics, forcing Bob to take the helm.
When the Time Bandit loses power with a storm at its tail, Johnathan deploys a camera probe to find what's snarling his propeller.
The snow crab fishery reopens as Keith and Jake race into a Siberian storm.
Winter season erupts as the fleet battles brutal seas and each other. Sig and Rick's alliance shatters as Keith fights through a debilitating injury and a short-handed crew.
Venturing 600 miles north, the fleet encounters subzero temperatures and freezing spray. Sig sets into a tidal surge, but the extreme forces leave Clark injured.
Keith & Jake deploy guerrilla tactics when a factory trawler invades their grounds. At the Russian Line, Rick encounters temperatures so frigid that even snow crab can't survive on deck.
After six relentless weeks at sea, man and machine push past the breaking point. While Keith seeks medical care in Anchorage, the Wizard loses steering in 20-foot seas.
As buyers close their doors, the fleet scrambles to collect its first opilio windfall in three years.