In a unanimous assessment of the officials of Defence Research and Development Organisation, the nuclear powered submarine is a complex platform than anyother vessel that India has built. According to the DRDO, the factor that enhances the scale of achievement of INS Arihant, India's first nuclear powered submarine, is that it will be fitted with K - 15 ballistic missiles that can be launched from under water. The K-15 missiles, which are already under production, can carry both conventional and nuclear war heads. They have a range of 700 kilometre.