The mission was not to find/attack a sub, it was to deter the sub because it could be seen by a blimp that could direct surface combatants towards the sub.
In WWII there was only a single occurrence of a ship being attacked and sunk by a sub that had blimp escorts.
When you look at the ships that were NOT attacked/sunk, the blimp significantly proved its worth in that mission.
These articles chronicles the exchange between the K-74 and U-134.
Note: A common misconception is that K-74's Mark XVII depth charges failed to release as the blimp passed over U-134, however this is known to be false as the sub received below-the-waterline damage consistent with a depth bomb. This was stated in a Secretary of the Navy Letter of Commendation, 13 Oct. 1960
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