I am curious as to what qualifies a person to call themselves a Marine Scientist? The most popular definition that I can find online of a "scientist" appears to be "A person who is studying or has expert knowledge of one or more of the natural or physical sciences.". So....... since almost all divers by default have to either study or have knowledge related to the natural or physical sciences of diving..... then most divers are in fact Marine Scientists! Congratulations! Now when your grandkids ask what you do, you can say...... I'm a diver and a Marine Scientist!