I have met Michael Kane, who is mentioned in one of the books about the Andrea Doria. He wasn't at all what I expected -- I was envisioning a skinny, pasty, vegan GUE instructor, and found a talkative, friendly, colorful man who welcomed me into his house and told me stories of how a hard-core NJ wreck diver got converted to DIR.
I've spent a good bit of time with Andrew Georgitsis, who isn't a diving "legend", but has certainly done some truly amazing things (check out the Red Sea Explorers website for the cave dive at 300+ feet that they did). Andrew's vocal, opinionated, a good story-teller, and an absolutely superb instructor.
And I took my Cave 1 class from a man who isn't a diving legend, because very few people have heard of him. And that's the way he is. But his team has pushed tremendous distances into the caves of the Yucatan, and is working steadily and tirelessly to promote cave and water conservation in the Riviera Maya. Danny Riordan doesn't have time to become a legend -- he's too busy diving and teaching and educating.