Icebreaking tugs and supply ships travel across the pack ice of Lake Michigan.
Titles read: "'WARE ICE!"
Lake Michigan, Chicago, United States of America.
Various shots of supply ships and icebreaking tugs making their way across the "vast wilderness of pack ice" covering Lake Michigan after blizzards and extreme weather has hit the area. A supply ship reaches a marooned depot and men unload crates and sacks of food.