Marty has a near death experience when he plummets through ice on a frozen waterway. Meanwhile, Lauro journeys deep into the untouched backcountry by dog team to establish an expedition camp. Mike crafts a bridge from driftwood logs to traverse a rushing river. On the coastline, as provisions run low, Cub secures a deer to stave off hunger. And Daniel navigates swift currents, venturing to a secluded island to trap elusive river otters.