In RL, subs were sunk on the surface by other subs most of the time (all of the time?)
It was either a chance encounter, or because chatty IJN subs were sticklers for being at assigned lat/long locvations at very specific times and we read their codes. So ULTRAs would tell a US sub to be a a spot, and noon that day the jap sub would be there on the surface. BOOM.
There was virtually zero "hunting" like red october, you either saw them or you didn't. SOP for the watch seeing another periscope was to ring up flank, turn away, and pull the plug.
tater
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