Torrential rain stops Karl from digging pay dirt and clogs his sluicing water pump's intake system; Nika and Chris' new crew member Nick gets their only stripping dozer hopelessly stuck in the mud of their new cut; when Bernie increases "Bouncing Betty"'s pay dirt and water volume, the sluicing water pipeline can't handle it; Big Al makes steady progress rehabilitating, but has a disappointing gold haul.