The North's subs are loud and they will be sunk eventually, but what damage might they cause before they are sunk?
Here's a story on the North's military - see:
http://www.huffingtonpost.com/2013/...eas-military-capabilities_n_3153691.htmlWith thousands of artillery pieces and millions of men under arms, they can cause a world of hurt before they are stopped, even after their subs and aircraft are destroyed.
Food for thought.