The "Stars" of the Marineland of the Pacific Oceanarium are the playful porpoises. Here, a couple of friendly 350-pound specimens of the sea mammal dive for a ball, given to them by diver Jake Jacobs. It's no joke to balance that 50-found helmet on his shoulders while wrestling with porpoises in a heavy current here. This is really hard work, though it looks easy as Jake moves gracefully through the water, serving meals to the fish and sea animals and playing with some of them. March 18, 1955. (Photo by United Press Association).