Heroes of the Atlantic (1941)
Although not specifically about the Jervis Bay, this 1941 documentary
produced by the Canadian Government Motion Picture Bureau gives the viewer a
sense of the times, and further insight into the role of the Merchant Navy.
To view the movie, click on the image above. Or, you may chose to visit the NFB page here to read more information.
You might also enjoy "Atlantic Patrol", produced 1940.