ðeɪ wɜː ɹᵻplˈeɪst baɪ kənvˈɛnʃənəl wˈɛpənz sˈʌtʃ ɐz ðɪ ˌɛmkˈeɪ fˈɪfti fˈoːɹ toːɹpˈiːdoʊ ðæt pɹəvˈaɪdᵻd ˈɛvɚɹɪŋkɹˈiːsɪŋ ˈækjʊɹəsi ænd ɹˈeɪndʒ æz ˈæntaɪsˈʌbmɚɹˌiːn wˈɔːɹfɛɹ tɛknˈɑːlədʒi ɪmpɹˈuːvd.
They were replaced by conventional weapons  such as the Mk 54 Torpedo that provided ever-increasing accuracy and range as anti-submarine warfare technology improved.