On extremely rare occasions, you may be incredibly lucky and see Mickey Mouse scuba diving in the main tank down in the SeaBase. This is an extraordinary circumstance, however, and you have to be very lucky to catch him.
In 2019, he made several very brief appearances throughout the day on June 8th - World Oceans Day.
The Seas pavilion consists of 'The Seas with Nemo and Friends' attraction, Turtle Talk with Crush, the main exhibit tanks, a store and the Coral Reef Restaurant.