Navy Day in India is now celebrated to commemorate Operation Trident, which was the attack on the Karachi harbor during the Indo-Pakistan war (on 4 December 1971) by the Indian Naval Missile boats as well in to reverence all the martyrs of that war. During the attack, Indian sailors communicated in Russian to avoid detection. No Indian sailors were killed in the attack. The theme of Navy Day 2020 is "Indian Navy Combat Ready, Credible &amp; Cohesive". "Covid-19 and Chinese attempts to change status quo along northern borders have posed new challenges. The Navy is ready to face both these challenges," Admiral Karambir Singh, the Navy chief said at a press conference on the eve of Navy Day.