Complete the following sentence: Nigba ogun ọdun 1971, o jẹ olori awọn ọkọ oju-omi oju omi meji ti Arnala-class INS Kiltan ati INS Katchall ti o jẹ apakan ti ẹgbẹ iṣẹ-ṣiṣe ti o kọlu Karachi Harbour ni ọjọ 4 Oṣu kejila ọdun 1971 lakoko
Ìgbésè Trident. Awọn corvettes meji ni a fi ṣe iṣẹ lati pese awọn ibaraẹnisọrọ ati ṣiṣe gbigba ibi-afẹde pẹlu radar wọn ti o ga julọ bakanna bi fifun ideri-submarine.