It takes a certain kind of person to willingly jump into a tuna pen 120 miles offshore, wrestle deadly sharks out with their bare hands and live to tell the tale - but for South Australia's tuna fishermen, it's all in a day's work.From the makers of Deadliest Catch (use show's title treatment) comes the hit series profiling Australia's toughest fishermen: Tuna Wranglers. The mighty Southern Ocean has long been a shipping graveyard, with monstrous waves powering across the remote seascape. But each year, the fishermen take up a unique challenge: To spend two months rounding up, caging and dragging home millions of dollars worth of live southern bluefin tuna to fatten up, and sell to the lucrative Japanese market.