Washington: An American undersea explorer has completed what is claimed to be the deepest manned sea dive ever recorded, and he found plastic trash down there, reports CNN.

Victor Vescovo journeyed 10,927 metres to the bottom of the Challenger Deep, the southern end of the Pacific Ocean’s Mariana Trench, as part of a mission to chart the world’s deepest underwater places.

Making multiple trips nearly 11 kilometres, or seven miles, to the ocean floor – one of them four hours in duration – Vescovo also broke the record of Titanic director James Cameron in 2012 for the deepest solo dive in history.

As well as four new species that could offer clues about the origins of life on Earth, Vescovo observed a plastic bag and candy wrappers at the deepest point on the planet.

Vescovo, a 53-year-old financier with a naval background, told CNN Travel his journey to the depths was about testing the limits of human endeavour as much as scientific discovery.

‘Going to the extremes I believe is a natural inclination of man,” he told CNN. ‘I think it is a wonderful part of human nature that makes us want to push ourselves to the limits, which has helped propel us as a species to where we are now.’

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.

The expedition’s mission is to conduct detailed, sonar mapping missions at the five deepest spots in our oceans. As well as the Mariana Trench, it’s now completed surveys of the Atlantic Ocean’s Puerto Rico Trench, the South Atlantic’s South Sandwich Trench and the Java Trench in the Indian Ocean.

Next up is a trip to the bottom of the as-yet unexplored Molloy Deep in the Arctic Ocean, due to be completed in August 2019. The ocean depths represent some of the least explored and remote places on the planet. The Mariana Trench is deeper than Mount Everest is tall. A key mission objective was to capture video evidence of what was at the bottom of Challenger Deep, which was first explored in 1960.

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