It is sport among black belt sushi eaters here to see just how daring one's palate can be. But even among the squid-chomping, roe-eating and uni-nibbling fans, whale is almost unheard of on the plate. It also happens to be illegal. Yet with video cameras and tiny microphones, the team behind Sunday's Oscar-winning documentary film "The Cove" orchestrated a Hollywood-meets-Greenpeace-style covert operation to ferret out what the authorities say is illegal whale meat at one of this town's most highly regarded sushi destinations.