Mariana Trench: Record-breaking journey to the bottom of the ocean

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In a four-hour dive earlier this month, Vescovo and his team undertook the deepest dive ever made by a human inside a submarine named DSV Limiting Factor.

Vescovo's mission also discovered less than exciting findings: plastic bags and candy wrappers at the bottom of the trench.

The expedition reached a maximum depth of 10,928 meters into the Trench.

In the last three weeks, the expedition has made four dives in the Mariana Trench in his submarine "DSV Limiting Factor", collecting biological and rock samples. Robotic landers were also deployed to explore the remote terrain.

"We wanted to prove the capability of the submarine and the whole system by diving there repeatedly and really, hopefully, opening the door for science", Vescovo said.

"Maybe I felt much more like Don Walsh and Jacques Piccard".

He told BBC News: "I salute Victor Vescovo and his outstanding team for the successful completion of their historic explorations into the Mariana Trench".

"Now in the winter of my life, it was a great honour to be invited on this expedition to a place of my youth".

According to the Dallas News, at the very bottom of the Challenger Deep Vescovo found a plastic bag and other bits of trash. While he saw particles of an object, he can't be certain if it was made of plastic or metal.

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In an interview with CNN, the American diver said his team were going to perform tests on the creatures to determine the percentage of plastics found in them.

Vescovo's dive was one of five made by the team between April 28 and May 5, which included the deepest marine salvage operation ever attempted. The explorer is part of the Five Deeps Expedition, which aims to reach the bottom of every ocean on the planet. It is located in the Tonga Trench, considered to be the second-deepest ocean trench in the world.

Victor Vescovo stands next to a submarine that he took to the deepest point on planet.

A 90-millimeter-thick titanium pressure hull built to withstand the pressure of the deep.

As well as working under pressure, the sub has to operate in the pitch black and near freezing temperatures.

Deep in the middle of the Pacific Ocean, Vescovo dove 35,853 feet beneath the waves, breaking previous records by about 36 feet.

"And now in 2019, the Five Deeps Expedition's submersible Limiting Factor was the third", Walsh said, adding, "And I was there to see it". Atlantic Productions for Discovery Channel/Handout via REUTERS.

Diving isn't Vescovo's only passion- he's also a climber.