Possible serious threat to U.S. Navy.

[AztecWilliam]

Perhaps you thought that diesel powered submarines were as antiquated as vacuum tube radios. Maybe not. In any event, this author explores some important defense questions.

nationalinterest.org/blog/the-buzz/could-sink-the-us-navy-lethal-stealth-submarines-15034

AzWm

[AlwaysAnAztec]

Jan 29, 2016 9:29:14 GMT -8 AztecWilliam said:

Perhaps you thought that diesel powered submarines were as antiquated as vacuum tube radios. Maybe not. In any event, this author explores some important defense questions.

nationalinterest.org/blog/the-buzz/could-sink-the-us-navy-lethal-stealth-submarines-15034

AzWm

It is my understanding that the air-independent propulsion systems (AIP) were primarily developed in Germany and are being sold all over the world.  Nice ally.

[aztecwin]

Developments and innovation in this kind of thing are constant. By the time this kind of article comes out unclassified it is old news.