The earth's surface is divided into vast interconnected waters by the mainland, called oceans, with a total area of about 360 million square kilometers, accounting for 765,438+0% of the earth's surface area and an average water depth of about 3795m m. The oceans contain more than1350 million cubic kilometers of water, accounting for about 97% of the earth's total water, and only 2% is available for human consumption. The four oceans of the earth are the Pacific Ocean, the Atlantic Ocean, the Indian Ocean and the Arctic Ocean, and most of them are bounded by land and seabed topographic lines. So far, only 5% of the seabed has been explored by humans, and 95% of the seabed is unknown. [3]