The newly discovered coral reefs in tropical Indonesia reveal that they are one of the richest in the world. They are home to fantasy-like creatures - such as the head-butting pygmy seahorse, the flashing electric clam and bands of 30-strong sea snakes which have never been filmed before as they the hunt in packs, using cunning strategy. This episode uncovers mysterious giant colonies of seabirds nesting in the baking Arabian Desert and ingenious surfing dolphins, that have learnt to hydroplane right up onto the beach to catch their fish. Diving with balletic sea lions among vast swirling bait balls of anchovy, the greatest gathering of seabirds and whales in the ocean are filmed for the first time as they gorge on krill.