Section 221(4) in The Naval Ceremonial, Conditions Of Service And Miscellaneous Regulations, 1964
(4)Death or serious illness of the Chief of the Naval Staff.-If the Chief of the Naval Staff should die, or if the state of his health should make it absolutely necessary for him to quit his command without waiting for the appointment of his successor, the Deputy Chief of the Naval Staff shall forthwith assume command of the Service until such time as the directions of the Government are received.
