North Korea has a growing arsenal of sub-launched missiles that might not fit in the subs meant to launch them

• North Korea unveiled a new "tactical" missile submarine in September.
• The sub appears designed to carry a mix of ballistic and cruise missiles.
• That mix may reflect desire for more firepower — or an inability carry the North's largest SLBMs.

In September, North Korea launched the Hero Kim Kun Ok, a diesel-electric-powered ballistic missile submarine.