Winter brings about the destruction of six fishing boats on the Bering Sea; the salvage tug Redeemer sets out on a rescue. A tugboat embarks on a rescue mission in the Bering Sea in the opener of the documentary series exploring dangerous bodies of water.
A fishing competition in the Gulf of Alaska unfolds. The Sea Barb battles treacherous waves in an attempt to net a quarter of a million dollars; the weather forces rival fishing boat Irene H to take shelter from the raging seas.
The deadly North Atlantic Sea has claimed the lives of 165 people in the last 10 years; the dangers of scallop-dredging. Scallop dredging in the North Atlantic is discussed in the series finale.