Winter season erupts as the fleet battles brutal seas and each other. Sig and Rick's alliance shatters as Keith fights through a debilitating injury and a short-handed crew. The Titan Explorer loses steering in heavy seas, leaving Jake dead in the water.

Venturing 600 miles north, the fleet encounters subzero temperatures and freezing spray. Sig sets into a tidal surge, but the extreme forces leave Clark injured. While Keith fishes through pain, Jake's risky pact unravels when a key man goes down.