When the Time Bandit loses power with a storm at its tail, Johnathan deploys a camera probe to find what's snarling his propeller. Keith sets a decoy string to lure Sig away from good fishing, but risks his own secret plan by trusting the wrong ally.

When Sig's fishing information falls into the wrong hands, he deals his protégé a lesson he won't soon forget. After his crew gets slammed by back-to-back waves, Rick faces a gun-shy deckhand. Sophia contends with a crewman with a badly infected tooth.

A below-deck brawl puts Sophia "Bob" Nielsen's captaincy to the test on the Seabrooke. A hydro leak on the Summer Bay threatens to send Wild Bill's King Crab season into the red. Rick must make a crucial decision when Jacob's deckmate crosses the line.

After leaving Sig's boat, Jake has a lot to prove on the massive Titan Explorer. Sig and Johnathan jockey to get ahead of a migrating king crab hoard in an underwater canyon. Rick faces Keith's wrath when his captain-in-training launches a rogue set.

The crews and battered boats are feeling the brunt of one of the hardest Opilio seasons on record. While some crew members battle potentially catastrophic breakdowns to stay on the grounds and keep fishing, others throw in the towel and call it quits.

The Cornelia Marie uses US satellites to spy on the Russians, Scott pioneers a dormant fishery and Wild Bill faces off with a Russian greenhorn.

When Sig and Mandy disagree on a fishing strategy, Clark is caught in the middle. Wild Bill comes down hard on deckhands as Linda gets too close to danger. Keith pulls the Wizard alongside the Saga and unleashes unexpected bad blood.

A cracked tank on the Titan Explorer leaves Jake's engines vulnerable to seawater. Keith fires another deckhand but struggles to get rid of him for good. Johnathan prescribes alternative cures as the norovirus overtakes the Time Bandit crew at sea.

Captains scramble to meet an expanded quota in the path of a violent system dubbed "Squall-pocalypse". A breakdown on the Wizard puts Monte in debt to the Time Bandit and Josh and Casey exceed their own quota when it comes to injuries on deck.

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; Harley breaks in a new co-captain, only to break down at sea.

Josh and Casey haul in their biggest pots ever, starting a gold rush to the Russian line. Captain Bill gets some inside intel, while Harvey confirms the numbers his own way. As Arctic Storm Elsa strengthens, the fleet realizes the ice queen casts a deadly spell.

As competition heats up on the King Crab grounds, Jake's next move puts him at odds with Capt. Sig. Wild Bill battles heavy seas and side effects, while Sophia "Bob" Nielsen attempts to pop in a deckhand's dislocated hip to avoid a steam back to town.

On the Northwestern, Captain Sig contends with a man overboard for the first time in his career. Johnathan comes up short on crab but sees the tide turning when thousands of porpoises guide the Time Bandit in a new direction. Jack tangles with Wild Bill.

As the first Siberian storm slams the grounds, Sig sets into 40-knot winds, risking capsizing when his tank floods. Sophia must prove she can drive a boat and lead her crew in severe weather while Jake battles insubordination from his own new crew.

Johnathan alters time in an attempt to get to port for an anniversary he promised Heather on land; Rick battles a Bering Sea gale that knocks his deckhand out of commission; Sophia helms the Seabrooke in the roughest weather she's ever seen.

A typhoon brings monstrous waves and high winds to the west; Rick and Bob attempt to stitch a head wound in turbulent seas; John risks capsize to make a harbor entrance; an emergency tests Jake between his duties as captain and man of the house.

It's winter in Dutch Harbor and the fleet prepares to hunt Opilio crab. The season looks promising with the quota up and the price high, but tensions rise before the lines are thrown as one deckhand quits, two brothers fight and one goes overboard.

Saga loses a veteran deckhand, forcing Jake to steam a greenhorn army to the Russian line. Amid scuttlebutt that ports are closing due to a virus, Josh fights to get home for a reunion with his brother and Sig's daughter gets rushed to the hospital.

Sig gets tough news at sea forcing the Hansens to make a critical decision as John and Andy lend a hand. With wheelhouse ambitions, Jacob hits a wall with Keith on the Wizard. New captain Jack crosses a line when Harley makes a deal with Jake.

A new deckhand falls ill on the Time Bandit, raising questions for Andy and warning signs for John. A bait pallet breaks loose, forcing Captain Rick to deal with a severe crew injury. When Wild Bill's plan A fails on the Summer Bay, Maria tries plan P.

An early closure forces captains to work together to get their catch safely to port; Sig crosses a line when he repositions a rookie captain's pots; Jake and Sean race back from Adak while Linda bolsters her east coast reputation in the Bering Sea.

Sig and John co-captain The Time Bandit, sparking a gold rush for crab out west; chaos on the Titan Explorer forces Jake's crew to abandon ship.

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. The Wizard faces a nightmarish mechanical failure when Keith's throttle fails in rough seas.

Sig must act quickly as heavy ice entombs the Northwestern. When Keith's Australian greenhorn challenges his old-school command, a culture clash erupts. Hellbent on earning an ownership stake in the Titan, Jake hauls pots at a blistering pace.

Past the halfway point of the King Crab season, man and machine alike show signs of wear under the brutal hand of the Bering Sea. While repairs can be made to the equipment, the fishermen must dig deep to soldier on in a place where nature rules.