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The Dakota Boys are digging down to bedrock gold but when they hit the biggest boulder of the season Dustin is forced to rig a new mechanical solution the Graboid.
The Dakota Boys' desperate bid to hit bedrock gold is thwarted when 73-year-old Fred's heating system fails mid-dive and he's is overcome by the glacial Alaskan water.
A flash flood racing down McKinley Creek threatens to kill the crew members and destroy their operation, but the Dakota Boys still manage to find more gold than they've got all season.