New series. Chris Packham, Steve Backshall and Liz Bonnin present a week of live programmes examining aquatic wildlife around the globe and the current state of the world's oceans as animals struggle to thrive in the face of increasing environmental pressure. Chris visits the world's biggest whale nursery in Mexico, Steve goes swimming with tiger sharks in the Bahamas, and Liz meets scientists performing experiments on coral to help preserve the Great Barrier Reef, while also encountering new-born turtles living on a nearby island.