 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 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.The Neptunes flew various patterns fully testing the Otago's radar, electronic warfare and IFF passive and active capabilities.