Japanese I52 traveled 3 months from Japan to Europe to deliver goods to support the Reich's war effort. It was intercepted midAtlantic and attacked by a TBF Avenger from the escort carrier Bogue. The TBF deployed sonobuoys, depth bombs and ultimately a Mk24 acoustic homing torpedo, Fido. The torpedo struck and sank I52 will all 109 hands. Details of the attack are unpacked and the underwater sonobuoy sounds are described. This submarine was one of 998 axis subs that were sunk in WWII.