His voyage, in a submersible named The Limiting Factor, is part of a landmark odyssey into the world's watery depths that's being filmed for Discovery Channel - dubbed the Five Deeps Expedition.
Sir David Attenborough, a naturalist and wildlife campaigner, reacted to Vescovo's unsavory find at the bottom of the Mariana Trench by calling plastic in the sea an "unfolding catastrophe" that we "ignore at our peril".
His record breaks those set by U.S. Navy lieutenant Don Walsh and Swiss engineer Jacques Piccard who touched down on the seafloor at the depth of 10,912 meters in their submersible in the 1960 and movie director James Cameron who reached the same limit in 2012. He descended an impressive 35,853 feet (10,927 meters) into the Pacific Ocean, 52 feet (16 meters) deeper than any previous crewed dive. More worrisome was that Vescovo reported coming across a plastic bag and candy wrappers.
It was the third time humans have dived to the deepest point in the ocean, known as Challenger Deep.More news: Two French tourists rescued from militants in Burkina Faso
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Vescovo's team made a total of five dives into the trench over the course of the expedition, during which the team reportedly may have discovered four never-before-seen species of amphipods.
"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", says Vescovo. "This submarine and its mother ship. took marine technology to a ridiculously higher new level by diving-rapidly and repeatedly-into the deepest, harshest, area of the ocean".
The expedition has explored the deepest points of four of the five oceans so far, leaving only the Arctic Ocean's Molloy Deep, exploration of which is scheduled for August 2019.
A documentary series that chronicles his expedition will air on Discovery Channel later this year. It is located in the Tonga Trench, considered to be the second-deepest ocean trench in the world.
Last month, Vescovo became the first human to dive to the deepest part of the Indian Ocean: the Java Trench.
Vescovo also made progress toward his larger goal.