PDTV | 832x468 | .MP4/AVC @ 1303 Kbps | 58 min 11 s | 610 MiB Audio: English AAC 160 kbps, 2 channels | Subs: English Genre: Documentary
Coral reefs are home to a quarter of all marine species. Survival in these undersea mega-cities is a challenge with many different solutions. A turtle heads to the reef's equivalent of a health spa - but she must use trickery to avoid the queue. A remarkable Grouper uses the fish equivalent of sign language to collaborate with an octopus, flushing their prey out of hiding holes. A metre-long, ferocious-jawed Bobbit Worm hides in its tunnel. Monocle Bream retaliate by squirting water to expose its sandy lair. .