Watch this 11-minute, pre-World War II Navy training film that taught submarine crew members about the buoyancy of a submarine on NavyTV.
Posted by NavyTV in Uncategorized
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I think the link for this is: http://www.navytv.org/media.cfm?m=3493&startRow=6&pageNum=2&searchField=submarine&sort=m.Title
Pretty good film.