Right now, humpback whales, sea lions, great white sharks and the biggest of them all, blue whales, are heading to Monterey Bay, California. Join Matt Baker, Liz Bonnin, Steve Backshall and Hugh Fearnley-Whittingstall to witness this spectacular natural event, live. Exploring both on and beneath the surface, they will reveal what's behind this, the greatest gathering of marine wildlife on the planet.