Children at the aquarium in Paris, France, were treated to a diver dressed in a Santa Claus costume as he swam with fish on Friday. /VCG Photo

Celebrating Christmas, the diving Santa Claus plunged into the aquarium surrounded by exotic fish. /VCG Photo

Also known as Cinéaqua, the Paris Aquarium is one of the three aquariums in the city and is technically the oldest aquarium in the world, having opened its doors in 1867. /VCG Photo