Society of Explorers and Adventurers. Started as kind of an off-shoot for Imagineers to make in-joke references to the Adventurers Club. Harrison Hightower (owner of Tokyo's ToT), Mary Oceaneer (featured in the new Typhoon Lagoon ride), guy who mined Big Thunder Mountain, Jock Lindsey and Indiana Jones ... all were members of S.E.A. "Auntie" who the day care center in Aluani is named after was a member. The characters from AdvClub were retroactively made members as well. At this point, Master Gracie may also have been a member. Basically the Disney Theme Park Cinematic Universe, created in-house by Imagineering to amuse themselves.
To put it in perspective, I live in the heart of Tourist Orlando. I interact with the most hard-core of lifestylers on a daily basis, people who's homes are like Disneyana showcases. I know exactly one person obsessed with SEA. It's the most inside baseball IP out there.