The Maldives, the Seychelles, Mauritius and La Réunion are holiday destinations with noble resorts. But off the beaten tracks, they provide a fascinating diversity of species. From giant manta rays and tiny harlequin shrimps to sharks and jackfish hunting by night, clever cleaner fishes or sperm whales - the coral reefs unite everything, offer food, shelter and are home to some of the richest underwater worlds that still exist. The glossy series tells emotionally gripping stories - both under and above water - but also keeps an eye on the problems that the islanders have to contend with.