Yet few vehicles can survive plunging into this dark abyss. Cumulatively they account for an area of seabed equivalent to the size of Australia. Consisting of deep trenches and troughs, it extends 11km (6.8 miles) below the surface of the world's oceans. Named after Hades, the Greek god of the underworld, it is a forbidding place worthy of its name. The deepest parts of Earth's oceans are known as the hadal zone. They could even provide clues about where scientists should be searching for alien life. The hope is that the underwater discoveries they make will help to unlock some of the mysteries in outer space while also test some of the equipment and experiments needed for missions elsewhere in the Solar System.Įarth's ocean depths are surprisingly similar to some of the conditions Nasa expects to find on other worlds in our Solar System. It is a mission filled with wonder, danger and a not-insignificant risk of implosion. The US space agency is exploring the deep ocean to search for clues of what oceans on other planets could look like, and push the limits of science and technology in one of the most extreme environments on our planet. In fact, it is often claimed that we know more about the surface of Mars and the Moon than about the ocean floor on our own planet. Our oceans cover more than 70% of the Earth's surface, but over 80% of them remain unexplored.
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