The brilliant colors and extraordinary creatures of the undersea world are revealed as NOVA takes you on the most dramatic tour ever of the wonders of the Great Barrier Reef off Australia. It's an adventure down under that will amaze and even the most experienced divers. You'll marvel at the undersea world's dazzling display as NOVA uses new technology to present a day in the life of the world's largest coral reef. Other extraordinary camera techniques show what has never been shown before, from microscopic detail to breathtaking panoramas of millions of schooling fish. Prowl with the lion through an undersea jungle teeming with prey. In this fish-eat-fish domain, even the most innocent-looking have a surprising array of defenses, as the lion fish discovers after grabbing a poisonous, inflatable spine-tipped puffer fish. Slither with the sea snakes through living coral cities teeming with rainbow-colored dameselfish, clown fish and wrasse, Christmas tree worms, lurking moray eels, soaring manta rays and enormous whale sharks.