reverse was typically used on the surface for maneuvering not for underwater use as it used a LOT more energy to move the sub than moving forward and battery conservation was paramount. stern tubes were typically used for OMG!! WTF!! type of shot on destroyers that sneak up on the sub. they were also used for finishing shots on stubborn targets to save the bow shots. they were also used in nite surface attacks where the more powerful diesel engines could be employed for reverse maneuvering.
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