The fleet goes for broke as Kris launches his crawler deeper than anyone has ever mined. Shawn must haul massive, season-saving equipment through a rising river, and Chris makes a historic discovery: the biggest gold nugget ever found offshore from Nome!

The weather is turning, and it's become 'make or break' time for many miners in the fleet. Vern finds a lucky nugget, while Shawn battles freezing ground -- but Joe loses his ace diver. Facing mutiny, Zeke pulls up his stakes to find a new claim.