sampled California that's probably how well we know the Marianas Trench I'm to date less than five percent of the world's oceans have been explored on but only by returning to the oceans very deepest reaches will be fully comprehend the incredible forces that recycle and rebuild our world on way I like to think a bit is that ocean exploration leads to new research questions it and if we don't have exploration. we don't even know the right questions to ask it is now known what a geological wonder the Marianas Trench is since this deep chasm in the earth's crust was first discovered with the lake the rope and I love led more than a century ago evidence has piled up record-breaking died to the lowest point on earth giant undersea mountain ranges with bizarre magnetic zebra stripes proof that the ocean crust is spreading towards the hungry Marianas Trench line with slippery mud volcanoes which prevent devastating earthquakes and the planet's oldest ocean crust the reason that the Marianas Trench is the deepest point in the oceans in the darkest and most remote place in the world scientists have added to their knowledge about the powerful forces that contribute the dynamic story love our planet weld