The vibrant reef ecosystem of Raja Ampat is twice the size of Singapore. See how the mysterious manta ray lives in these waters.

The Indonesian archipelago lies in the heart of the Coral Triangle, a region of the ocean recognised worldwide as the centre of marine biodiversity. With the highest number of coral and fish species on earth, Indonesia has the richest reefs on the planet, but these reefs are under threat.

Step into the waters surrounding Indonesia's sprawling archipelago, home to the world's richest reefs and its highest marine biodiversity.

The Maldives, a low-lying archipelago in the Indian Ocean, faces an uncertain future. Rising sea levels threaten to wipe out this tiny island nation.

The Pacific coast of Costa Ricahosts nearly 5,000 species of marine life. But in this undersea jungle, the apex predator sharks are at risk.

The Wild Coast of South Africa is comprised of rivers that empty into the sea and indigenous forest.

Great Blue Wild joins the world's leading marine ecologists on a voyage of discovery as they venture to remote corners of the planet, uncover ocean secrets and fight to defend the endangered animals struggling to survive in our threatened seas. Dive deep with whale sharks and dolphins, brave danger with great white sharks and come one step closer to understanding the mysteries of the deep.

The coast of Mozambique is known for its giants: from the humpbacks that visit each winter, to the resident whale sharks that feed there year-round. But a closer look reveals a secretive world of tiny species that few have explored. Often overlooked, they are just as important to the ecosystems that they inhabit. On this wild and unpredictable coast, marine scientists work against the clock to protect Mozambique's smallest creatures, before it's too late.

It is the smallest of creatures that underpins the ocean's food web - plankton. Without them, marine life as we know it would cease to exist. But why?