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.
In a race against winter, Shawn extends his sluice to get more gold. Ken pushes the Myrtle 24 hours a day. Emily tangles with the tide. Kris battles a bed of quartz and George enjoys a season-ending dive with his son.
Newcomer Ken Kerr and the 600 ton beast Myrtle Irene threaten Shawn's plan to build his megadredge. The elements jeopardize Emily's plan to dive deeper. Kris heads to The Bluff with a new dredge, but faces complications.
Dangers rise with the tide when Shawn has a life-threatening mishap underwater and Emily's dredge The Eroica faces a possible collision. George prospects for brother Dave and his business partner Ken Kerr while the Kellys take home a chunk of gold.