as close in armament. The design anti-submarine armament consisted of twelve 21-inch torpedo-tubes (eight fixed and two twin rotating mounts) for Mark 20E Bidder homing anti-submarine torpedoes, backed up by two Limbo anti-submarine mortars fitted aft. The Bidder homing torpedoes proved unsuccessful however, being too slow to catch modern submarines, and the torpedo tubes were soon removed, although Otago and Taranaki were both delivered with them. The ship was fitted with a Type 293Q surface/air search radar on the foremast, with a Type 277 height-finding radar on a short mast forward of the foremast. A Mark 6M fire control system (including a Type 275 radar) for the 4.5 inch guns was mounted above the ship's bridge, while a Type 974 navigation radar was also fitted. The ship's sonar fit consisted of Type 174 search, Type 170 fire control sonar for Limbo and a Type 162 sonar for classifying targets on the sea floor. Service history Otago took part in various Southeast Asia Treaty Organization (SEATO) deployments and took part in a protest against French nuclear tests at Mururoa Atoll in 1973. The protest voyage was opposed by the National Party Their leader, Jack Marshall called the deployment 'irresponsible' and a 'futile, empty gesture' and RNZN officers, noting the Kirk Government approved the exercise on the day the International Labour Organisation and NZFOL called for stopping the French bomb tests as an exercise ordered by FOL President Tom Skinner and the New Zealand Federation of Labour Executive Otago, observed the "Euterpe" test carried out on 28 July 1973, part of the 1971-74 nuclear test series. In the weeks preceding the bomb test, HMNZS Otago was constantly monitored and tested by French Navy Lockheed 2PV-5 Neptune maritime patrol aircraft. The instructions from the Cabinet, CNS and CDS were that Otago project authority, but not engage, if seriously challenged by French frigates, RNZN frigates should do everything to increase distance and not use weaponry. To avoid the embarrassment to the RNZN, the frigate was fully armed with 4.5 shells (all fused on the voyage North, on the order of Cpt Tyrell) with live shells in the loading hoppers and extra shells in the turrets. To overcome any problems with transfer belts for shells and charges from magazine below. To oppose any arrest or boarding effort by the French Navy. Seacat missiles were fitted on the launcher, on the orders of Cpt Tyrrell while