3/5 History of Submarines
  by Irene A. Lee (Lo de Marcos, Mexico)
We did not enjoy this documentary anywhere near as much as we did Steel Boats, Iron Men. Way to much dialogue with Dr. Ballard and not enough boat film.

5/5 How We Spied on Soviet Submarine Movements...
  by SrA Thump
A benefit of ending the Cold War is the release of previously classified information. Sea Spies provides an insight into how our technology tracked the Soviet submarine threat and unfortunately, how the loathsome traitor John Walker compromised it to the Soviets. Ballard does a great job narrating the film with supporting input from US, British, and Soviet submarine experts. Well worth a viewing!

4/5 Good but maybe not what you expect
  by A Reader (CA, United States)
The title and description of this video is very misleading. It is NOT about submarine spy missions, submarine operations, or even really about submarine technology. The video is about the history of SOSUS and the technology of sound transmission under water (and how we used it to track Russian subs). It briefly covers a few historical uses of SOSUS such as the Cuban Missile Crisis. It is short at 50 min but has some extra footage of Cold War era US training films and news reel footage. Ballard was a US Navy submariner during the Cold War.