K-4 submarine-launched ballistic missile

The K-4 is a submarine-launched ballistic missile (SLBM) being developed for India's ARIHANT-class nuclear-powered ballistic missile submarines. The ARIHANT features a missile launch complex capable of accommodating 12 K-15 or four K-4 missiles. The second sub in the class, the ARIGHAT, is configured to carry 24 K-15 or eight K-4 missiles.

The K series of missiles (the K-15 and K-4) honor scientist and former Indian President A.P.J. Abdul Kalam (who served from 2002 to 2007), who...