In 2006 a US Navy aircraft carrier, the Ronald Reagan, was sunk by a Swedish submarine during exercises. What made the Swedish submarine so important that the US Navy wanted to ship one to San Diego for testing? The answer, something called "AIP".

Covert Shores style quick guide to Air Independent Propulsion (or Power) submarines. Termed AIP, this technology makes modern submarines more stealthy. See also on my Covert Shores Website http://www.hisutton.com/World%20surve...