Victor Vescovo, a retired naval officer and an investor in Texas was inside the submarine, he said that they saw an angular piece of metal and a plastic object that had some writings on it. He descended an impressive 35,853 feet (10,927 meters) into the Pacific Ocean, 52 feet (16 meters) deeper than any previous crewed dive.
Vescovo hopes his discovery of trash in the Mariana Trench will raise awareness of how much is dumped in the oceans, and will pressure governments to better enforce existing regulations, or put new ones in place.
"It is very important to us that we show some initial scientific discoveries, just to give a small sample of what we could do if the sub was in the hands of a professional research organization", he says.
An American diver has found a plastic bag almost seven miles beneath the surface of the ocean, during a record-breaking dive.
These conditions also made it challenging to capture footage - the Five Deeps expedition has been followed by Atlantic Productions for a documentary for the Discovery Channel. Film director James Cameron also made a second dive into the trench 2012.
Vescovo's dive was the first out of four dives carried out in the deep-sea pocket, known as Challenger Deep, over three weeks, starting in late April. Most importantly we have opened the door to the final frontier - the exploration of the hadal zone and the workings of the deepest parts of the world's oceans", "This vehicle is effectively a reliable elevator that can transport us to any depth, in any ocean.
This is not the first time people have found plastic waste in the deep ocean.
Scientists discovered what they believe are four new species living in the trench and retrieved the deepest piece of mantle rock ever recovered from the western slope of the trench.
In the May/June issue of Hydro International we'll publish an article about the Five Deeps Expedition. So far, besides the recent descent into the Mariana Trench, Vescovo has also dived the Puerto Rico Trench in the Atlantic Ocean (8,376m/27,480ft down), the South Sandwich Trench in the Southern Ocean (7,433m/24,388ft) and the Java Trench in the Indian Ocean (7,192m/23,596ft).