There is a new threat coming for all submarines ... a silent drone that sits on the bottom of the ocean in someone's inlet, someone's safe harbor, someone's patrol area that can be programed to rise up when it hears the distinct sounds a nuclear submarine makes (not to sure about diesel boats on batteries) and then like a remora on whales and sharks it attaches itself to your hull, clunk.
Now they can follow you across an ocean or watch you do slow turns to avoid being detected and send a plotting signal every time the sub comes up for a quick look around.
Isn't the future exciting?
