Re: Star Trek III - The [Speculation Begins] (Spoilers)
It was a year between the Kronos incident and the end of the movie. If the Klingons hadn't started a war in that time, the incident was likely taken care of through backdoor diplomatic channels.
"When I first heard about it (the Enterprise underwater), my inner Trekkie was in a rage. When I saw it, my inner kid beat up my inner Trekkie and made him go sit in the corner." - Bill Jasper