We think of reefs as exotic, distant places with little connection to our everyday world. Yet there are many kinds of reef, each of them a living city beneath the sea where plants and animals congregate in mutual benefit. They have a parallel existence to ours, distant yet undoubtedly connected. Each of them is a hotspot of biodiversity as vital to life on earth as the rainforests. Just as the Amazon has it's secrets, so too do the reefs. Reefs have been molding and shaping our shorelines, literally forming islands and mountains for millions of years. Yet in our lifetime, they have come under threat: human activity is altering the chemistry of the oceans. As the sea becomes more acidic, coral, shell, and bone begin to crumble. Shot on location in Palau, Vancouver Island, French Polynesia, Mexico, and The Bahamas, The Last Reef takes us on a global journey to explore our connection with the ocean's complex, parallel worlds. New underwater technology takes us into the heart of the reef, revealing a habitat more diverse and more colorful than you ever imagined