yes, days of patrolling without any result was a big morale problem
I have read USN submarine that were returning "empty handed" would deck-gun bombard Japanese held islands so that sailors would think they achieved something
Also fun to have food as morale boost; I mean yes, Uboats carried the very best food available in Germany, but this came with a catch: no freezer space to store fresh food meant that after a week or so their meals were a mix of canned, pickled and salted stuff. Uboat also lacked bread-making ovens, which was a significant morale boost in USN fleet boats
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