About Amazing Marina trench 

Marina trench. It is the most deepest spot ever located on the earth. It is even deeper if compared to the Everest height.  Marina trench is located in the western Pacific Ocean. This Marina trench is also known as the "Challenger Deep". In 2009, the marina trench was established as an US monument. 

Due to its deep space in the world it idealized for microorganisms to habitat in there. In 1960, and expedition was conducted and they have found a lot of rare aquatic species living in the challenger deep. 

They are, 

Flatfish. 

Shrimp 

Sea cucumber 

And a lot of microorganisms. 

The marina trench was proposed as a nuclear waste site at 1972. Because of its tectonic plates in hope that these tectonic plates will push them into the earth's mantle (which is the earth's second layer).  

But hopefully dumping nuclear wastes in the ocean is prohibited by the international law. 

Appearance in movies ,

As per I know I have only seen in "Life of pi" where the ship sinks in the marina trench costing most of the zoo animals (which his family owned) and the life of his mother, father, and his brother. 

The marina trench is still yet puzzles what other organisms and other life forms living inside the marina trench was what else lies in the marina trench. But perhaps with given time and with advanced tech we may can find out what lies in the marina trench. 

Thank you and peace.