From the Smithsonian Channel

Ways to Avoid Losing Oxygen in a Submarine

Name: Ways to Avoid Losing Oxygen in a Submarine
Uploaded: 2018-09-12
Duration: 150141
Description: In 1940, German U-boat commander Otto Kretschmer's submarine was under siege for hours and his crew grew tremendously stressed. In order to preserve oxygen, they had to find ways to stay calm.

In 1940, German U-boat commander Otto Kretschmer's submarine was under siege for hours and his crew grew tremendously stressed. In order to preserve oxygen, they had to find ways to stay calm.

Smithsonian magazine | 2:30