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Indeed! some had some did not The USS Gato herself never had them. In researching this topic, I came across this interesting vessel...slightly updated. Everything that could go wrong did. USS Grunion Although there is no absolute certainty the evidence strongly suggests that the Grunion was lost as a result of horrific torpedo performance in the confrontation with the Kano Maru. One torpedo ran low, but despite the magnetic pistol it did not explode; two others bounced off the Kano Maru without exploding. The last one circled back, hitting the periscope supports on the submerged submarine without exploding.That event, coupled with a jammed rear dive plane, triggered a sequence of events that led to loss of depth control. At about 1000 feet the sub would have imploded, then hit the bottom, breaking off about 50 feet of the bow. It then slid 2/3-mile down the side of an extinct volcano, finally coming to rest on a notch on the underwater mountain. https://en.wikipedia.org/wiki/USS_Grunion_(SS-216)