Answer: Mariana Trench
Notes: The Mariana Trench, located in the western Pacific Ocean is the deepest oceanic trench on Earth. Recently, the locations where the seafloor bottoms out in the Pacific, Atlantic, Indian, Arctic and Southern oceans were mapped by the Five Deeps Expedition. It found the deepest trench in the Indian Ocean was found at a depth of 7,187m. It is 387km from where previous data had suggested the deepest point could be.
