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 his brother Dave and his business partner Ken Kerr while the Kellys take home a chunk of gold.

In the Bluff's lawless waters, Shawn and Kris wield brute strength and verbal threats to stand their ground as raging competition forces captains to change tactics. In Nome, Emily and George use brainpower, gambling on new strategies and resources.