Tankers can actually take a tremendous amount of punishment compared to dry cargo vessels, because of their much greater subdivision- the "Ohio" (operation Pedestal Malta 1942) is a prime example. Much would depend on whether it was loaded at the time, and where you hit it. A tanker in ballast is a pretty tough customer.
When did you attack it- 1942? A large percentage of failures (prematures/duds/deep runners etc) was, unfortunately, "standard" at that time, so it is by no means unrealistic that all six were failures; the absence of any holes in the hull would tend to confirm the torpedoes exploded short.
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