Jaish underwater squad's terror plot revealed: How serious is the threat?

Six-month after Balakot airstrike, Jaish-e-Mohammed's planning a retaliatory attack on India. Navy Chief Admiral Karambir Singh said that they have received intelligence report that the underwater wing of Jaish-e-Mohammed is being trained. They are planning to hit Indian ships, energy assets, so how serious is the Jaish frogmen threat and how prepared is India?