The gold rush in Alaska isn't confined to the state's precious ground. It's taking place on the sea ... or more accurately, on the bottom of the frigid Bering Sea. This series, from the creators of the Emmy-winning "Deadliest Catch," follows four gold dredges and their eccentric and driven crews who risk their lives to find as much gold as possible before winter sets in and it's too dangerous to dive. The custom-built rigs, some barely seaworthy, include an 80-foot barge run by the most successful gold dredger in Nome, Alaska, and a modified skiff that seats only two people.