Deepest ocean expedition

Some of you may know a deepest ocean expedition last month. James Cameron, a famous movie director, dived into Mariana trench which is the deepest place in the earth. Supported by the national geographic, he spent hours hovering over the bottom and collecting sample, sucking sea creatures for study on the surface and video. One of his purpose would be search for a new 3D movie as well. Mt. Everest is about 5 miles above the sea level, but the deepest place in the Mariana trench is 8 miles below the sea level, so you can see how deepest it is. In higher mountain, oxygen density decrease as you go up. Some people can reach there without any mechanical support, although it is ultimate condition for human being. However, if you go down under the sea, oxygen density decreases, and water pressure increases, and light is gone finally. Obviously, it is impossible for human being to get to the deepest place without any machine support. You can know how ultimate place it is.

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When I first heard of this, I was really excited about this because the surface of the earth is already explored but deep ocean is not explored yet by human being. As far as I know, some ancient fishes, creatures are still living there possibly. We do not know it yet but I think that we still have romanticism in the deep sea. Until recently, space explores has been focused and they are already done as much as possible so far except some high energy physics phenomenon. However, I think that ocean explore will be focused thanks to this expedition.