At 0043 on 17 May, Gleaves, with Nields directing, fired an 18-charge pattern, with deep settings, which surrounded the U-boat.
æt zˈiəɹoʊzˈiəɹoʊfˈoːɹθɹˈiː ˌɔn sˈɛvəntˌiːn mˈeɪ, ɡlˈiːvz, wɪð nˈiːldz dᵻɹˈɛktɪŋ, fˈaɪɚd ɐn ˈeɪtiːntʃˈɑːɹdʒ pˈætɚn, wɪð dˈiːp sˈɛɾɪŋz, wˌɪtʃ sɚɹˈaʊndᵻd ðə jˈuːbˈoʊt.