This is Steve Irwin's last documentary, Ocean's Deadliest. Lurking only a few feet below the surface of eastern Australia's crystalline ocean are some of the most dangerous animals on the planet. For thousands of years, venomous snakes, saltwater crocodiles and immense sharks have patrolled these waters. Now, in the hope of studying nature's most dangerous creations, two adventurers of legendary reputation and pedigree embark on an epic mission that requires leadership of an experienced, knowledgeable and fearless crew. Irwin is joined by explorer and adventurer Philippe Cousteau, grandson of the famous oceanographer Jacques Cousteau, in Ocean's Deadliest as they explore the waters between Australia's Gold Coast and the Great Barrier Reef. Throughout this expedition, Philippe and Steve come face to face with venomous fish, huge great white sharks and amazing saltwater crocodiles as they search for the region's most dangerous animal. Along the way, they will meet the scientific experts who work with these creatures on a regular basis, learning the reason why they have evolved with such dangerous defenses and also learning that, in truth, they fill a role in the overall ecosystem that is vital and cannot be overlooked.