`If you do the same dive 100 times, do you have 100 dives or just one dive that you've done 100 times.
Each dive is counted separately. As long as the dive is at least 15 feet for 20 mins. (or however your agency defines a "scuba dive") then it's a dive. Doesn't matter if you do it once or 600 times. Every dive will have something different about it. Weather, nature, something.