– Aviation Week – The North Korean submarine threat looked bad enough after the torpedoing of a South Korean corvette in 2010. It has looked a good deal more serious since, as North Korea has worked to deploy nuclear ballistic missiles in submarines. All of this is making a South Korean program to buy additional maritime patrollers a rising priority. The likely contenders are now the Boeing P-8 Poseiden and Saab’s proposed Swordfish, based on the Bombardier Global 6000. The navy has dropped a plan to buy and refurbish 16 Lockheed Martin S-3 Vikings, shifting its focus to the possible order for new aircraft.