It is said that no biological fluctuation was invented at the depth of 10 thousand meters under the sea, so it can be seen that common creatures can't make a living at the depth of 10 thousand meters under the water. Therefore, you can imagine how terrible it is to be 10,000 meters under the sea. Moreover, the sunlight of 10,000 meters under the sea can't shine in, so all the seabed is dark. And without the help of any tools, normal people can dive about 10 meter, and some professional divers can dive 15 meter, or even 17 meter.