After drilling through a half mile of ice in Antarctica researchers made a surprising discovery: fish, crustaceans and jellyfish living and thriving in the brutally cold and dark waters beneath the Ross Ice Shelf. The find opens new questions about life in extreme ecosystems, such as we may find on other planets and moons. "This is the closest we can get to something like Europa," said University of California glaciologist Slawek Tulaczyk. Check out video here.