The Sunshine Coast Daily | Water from 400AD in mystery ocean abyss The Sunshine Coast Daily The “shadow zone” lies around 2km below the surface of the North Pacific Ocean and is thousands of kilometres long. Use this content. by Candace Sutton. IT'S called the "shadow zone" and it lies around two kilometres below the surface in an ocean abyss ... Demystifying Science: What is the Pacific shadow-zone? How a 'shadow zone' traps the world's oldest ocean water |