Activities of German sailors aboard a submarine underway in the Saint Lawrence River in North America.

A German submarine underway in the Saint Lawrence River in North America. A map shows places like Canada and New York. The German submarine underway in the river. Crew members play cards below the deck of the submarine. A man cooks food. Other men eat the food. The submarine submerges and the Canadian coast is scanned through a periscope. Torpedoes are fired and an oil tanker is hit. The oil tanker burns. Black smoke arises as the tanker burns.