I had to register just to comment. My job in the Navy was to hunt subs. Nuc's are quiet and are only limited in "time to work" by food and the moral of the crew. As long as there is food there is no reason to come up ever. A Nuc compared to a diesel submarine on batteries is a "Noisy Pig". Think about a truck engine next to an electric golf cart and tell me which is noisier? Diesels are limited by air and battery charge, they can't make air so they have to come up and change it and recharge the batteries. Doesn't take long to do. So, in a contest of stealth the Diesel on Battery wins hands down. They are almost invisible. Cost a lot less then a nuc by far. (Sorry I barged in here to rant)

Kerry!!!