The Bering Sea battle heats up as Shawn bets big on a new discovery he hopes will keep him ahead of Ken's massive dredge. The Kellys are forced to find new ground. Emily nearly boils a diver alive.

Winter winds force the captains to reevaluate risk and reward. Shawn's mega-barge extraction takes a turn for the worse. Ken pushes the Myrtle to the limit on a 5-day run. Emily sends her divers deeper. Kris invents a new form of prospecting.