Home to a staggering variety of marine life, from the charismatic clownfish to the terrifying tiger shark, coral reefs are the largest living structures on Earth. Visible even from space, these rich and diverse ecosystems possess unparalleled beauty and secrets that we are just starting to unravel.Back in action in Let?s Explore Coral Reefs, Charlie visits these cities under the sea and explains their importance to humanity. His words and message, coupled with stunning images, will whet the appetite of youngsters and stimulate them to continue learning and caring about the oceans and Earth they will inherit as adults.