 Under the command of Lieutenant-Commander Yousaf Raza, "Ghazi" returned to Karachi coast after successfully completing the submerged circumnavigation of Africa which was taken in order to undergo a refitting program and mid-life updates of her military computers on 2 April 1970.In August 1971, the Indian Navy transferred INS "Vikrant", its aircraft carrier, to the Eastern Naval Command in Visakhapatnam that forced the Pakistan Navy to adjust its submarine operations.Before 1971, there were several proposals made to the Ayub administration to strengthen the naval defense of East Pakistan but none were made feasible and the Navy was in no position to mount a defence against an approaching Indian naval advances.