Pakistan advancing in sea based Nuclear Weapons

Pakistan is advancing toward a sea-based missile capability and expanding its interest in tactical nuclear warheads.
The development of nuclear missiles that could be fired from a ship or submarine would give Pakistan “second-strike” capability if a catastrophic nuclear exchange destroyed all land-based weapons. But the acceleration of Pakistan’s nuclear and missile programs is renewing international concern about the vulnerability of those weapons in a country that is home to more than two dozen Islamist extremist groups.
washingtonpost