Watch on 123Movies. Spanning 2200 kilometers between Australia and New Zealand, the Tasman Sea is one of the world’s deadliest and most treacherous oceans. No one had ever successfully navigated the Tasman by kayak, although many had tried. This is the story of two young Australians, James Castrission and Justin Jones, who battled ten-meter towering waves, massive storms, shark-filled seas, and strong currents to conquer the Tasman.