This is a historical military training or informational film, likely produced by the U.S. Navy or Department of Defense during the Cold War.Documentary Overview This film specifically addresses the tactical use of nuclear depth charges (NDCs) as a primary deterrent against enemy submarines. Unlike standard depth charges, these weapons used nuclear warheads to create massive underwater shockwaves, capable of destroying or disabling submarines over a much wider radius.

Source: The Role of Nuclear Depth Bombs in Submarine Deterrence