Of my ~25 dives to date I've aborted at least three or four. Once I had an o-ring blow out on what I suspect was a too-loosely connected angle adapter, causing my primary second stage to leak, so dive over.
Another time it was because my buddy had trouble equalizing and then got vertigo on our first descent of the day, leaving us all dressed up with nowhere to go.
During our AOW course my buddy exhausted herself on a long surface swim and had to end the last dive of the day (wreck dive) the moment we had fulfilled the dive objective.
Although it sucks when it happens, I rarely find that an aborted dive does not provide a clear lesson on what could be done better in the future.
Another time it was because my buddy had trouble equalizing and then got vertigo on our first descent of the day, leaving us all dressed up with nowhere to go.
During our AOW course my buddy exhausted herself on a long surface swim and had to end the last dive of the day (wreck dive) the moment we had fulfilled the dive objective.
Although it sucks when it happens, I rarely find that an aborted dive does not provide a clear lesson on what could be done better in the future.