Wearing an air tank on his back, Santa wowed children at an aquarium.  

(On December 21, an aquarium employee put on Santa Claus uniform at the aquarium in Rio de Janeiro  according to Reuters and other media.)

He fed and swam with about 2,000 fish in the aquarium's tank. 

Children were thrilled to see Santa in an unexpected place, waving, taking pictures with him and enjoying the unusual Christmas spectacle. 

According to the Associated Press, the event started as a joke by an employee and has now become an annual event.