Havana ? There’s just no keeping Fidel Castro at home these days.

The aging revolutionary is suddenly popping up everywhere, most recently at Cuba’s National Aquarium on Thursday to take in a dolphin show and chat with aquarium employees, according to a report and photos in the state-run news website Cubadebate.

After four years of near total seclusion, it was the 83-year-old former president’s fourth appearance in less than a week.

Photos of Castro’s visit to a scientific think tank were published Saturday. He was interviewed on national television on Monday about his theory that the world is on the brink of a possible nuclear war. And he talked to academics at an economics institute on Tuesday.

Thursday’s visit to the aquarium in Havana’s leafy Miramar neighborhood was a bit lighter, with Castro taking in a dolphin show and asking employees about the internal workings of the center, the website said. He regaled those in attendance with stories about how long he could hold his breath underwater as a youth — two minutes — and reminisced about an opportunity he had to swim with dolphins in Holguin.