According to the book The Canadian Naval Chronicle (F.McKee and R. Darlington) credit for sinking U-484 (KK W.A. Schaefer) was eventually given to the RCN since a Mention in Dispatches was awarded to LCdr Nicholson of HMCS Hespeler in October 1945. The attack on U-484 employed a combination of depth charges, Hedgehog and Squid and the narrative indicates that Squid was the decisive weapon.
I doubt if 1944 hydrophones could have detected or identified the effects Seaveins suggests particularly if failure of the pressure hull was concurrent with a triple salvo of Squid projectiles. Particularly since the RCN was usually last in line for modern electronics although again the narrative can be interpreted to read that Hespeler was better equipped than Dunver which makes some sense since she was a frigate and not a corvette.
Note that at least one, perhaps two secondary explosions were noted that were in addition to the three from the killing Squid salvo. One would think that the noise of these and the shallow water might have prevented further acoustic detection.
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