The survivalists are confronted with one of their biggest obstacles yet: the Nizina River. River crossing opportunities are hard to come by, and the rushing, unforgiving glacial waters could sweep even the toughest explorer off his feet. For as much trouble as the river presents, it also provides desperately needed salmon for their stocks. But the explorers aren't alone in fishing these waters: hungry grizzlies roam the banks.
Source: National Geographic Channel