Diver breaks record with deepest submarine voyage ever recorded, finds discarded plastic

During his four-hour excursion, Vescovo spotted new sea creatures - as well as a plastic bag and candy wrappers.

Victor Vescovo, a retired naval officer, made the unsettling discovery as he descended almost 10,928 metres to a point in the Pacific Ocean's Mariana Trench that is the deepest place on Earth, his expedition said in a statement on Monday (May 13).

They also collected samples of brightly-coloured rocky outcrops from the seabed.

"It is nearly indescribable how excited all of us are about achieving what we just did", Vescovo told the BBC.

In the Java Trench, the deepest point of the Indian Ocean, researchers identified a gelatinous animal - thought to be a stalked ascidean, otherwise known as a sea squirt - which they said does not resemble anything seen before. "This submarine and its mother ship, along with its extraordinarily talented expedition team, took marine technology to a ridiculously higher new level by diving - rapidly and repeatedly - into the deepest, harshest, area of the ocean".

Filmmaker and National Geographic Explorer-in-Residence James Cameron emerges from the Deepsea Challenger submersible after his successful solo dive to the Mariana Trench, the deepest part of the ocean, March 26, 2011.

Scientists plan to test the newly-discovered creatures to see if they contain microplastics.

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.

He spent four hours exploring the bottom of the trench in his sub, built to withstand the enormous pressure of the deep ocean.

The latest descent, which reached 10,927m beneath the waves, is now the deepest by 11m - making Victor Vescovo the new record holder.

The team believes it has discovered four new species of prawn-like crustaceans called amphipods, saw a creature called a spoon worm 7,000m-down and a pink snailfish at 8,000m.

Prior to Cameron's dive, the first-ever expedition to Challenger Deep was made by the U.S. Navy in 1960, reaching a depth of 10,912 meters.

After spending hours crisscrossing the bottom of the Challenger Deep, collecting video evidence of different wildlife, geological formations and man-made objects, Vescovo stopped for a second. Next, he will attempt to reach the bottom of the Arctic Ocean's Molloy Deep.

His voyage took place in a submarine called The Limiting Factor, which is how Mr Vescovo is able to explore some of the most remote places on the planet. According to the BBC, the pressure at the bottom of the ocean is equal to about 50 jumbo jets piled on top of a person.

They also observed a variety of critters.

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