The I.N.S. Mysore seen in the film was a WW2 British Fiji Class Cruiser, H.M.S. Nigeria that was sold to the Indian Navy in 1957. The ship was decommissioned soon after the film was completed. The current (2006) I.N.S. Mysore is a newer vessel.
The "senior pilots of the Indian Air Force" who are credited with providing assistance with the aerial photography were drawn from No. 4 Squadron, IAF ("The Fighting Oorials"). It was their MIG-21Bis' that were used in the aerial combat sequences and much of the film was shot at their then base in Poona/Pune.