Its an awesome series. Great Reenactments and interviews with vets.
I like the last episode the best, where it describes different attack methods. It seems the US Subs were more flexible when it came to who did what on an attack. The Captain might main the scope himself and call out the data or have his executive officer do it. The method varied from captain to captain.
Also how some captains early in the war gave up on the faulty magnetic exploder and would violate orders by using the contact..but that was faulty too!
All in all a good buy!