Movie director James Cameron - who made the films Titanic and Avatar - then made a dive in 2012 by himself in a bright green sub.
Vescovo and his team saw a pink snailfish, a spoonworm and also discovered four new species whose genetic information could help with medical research.
Details of the voyage, made May 1, were released for the first time on Monday.
Deep in the middle of the Pacific Ocean, Vescovo dove 35,853 feet beneath the waves, breaking previous records by about 36 feet.
Lahey said the Limiting Factor "represents a quantum leap in the capabilities of a manned submersible and everyone at Triton is immensely proud to have had the privilege and opportunity to create such a remarkable craft, which was only possible by the unwavering support and vision of Victor Vescovo". Humanity's waste had reached the deepest parts of the sea floor.
Vescovo spent four hours underwater in one of several dives completed by the team in The Challenge Deep.
The ocean depths represent some of the least explored and remote places on the planet.
Due to the small difference in measured depths between the Challenger and Horizon Deeps, Vescovo and team plan to find out once and for all if the Tonga Trench is actually deeper than the Mariana Trench. He took the journey with Swiss oceanographer and engineer Jacques Piccard.
"In most of the depths I've been down [to] I've seen contamination of plastic or things I can't even recognize but they're definitely man-made which is really unfortunate", Vescovo said.
Before Cameron's dive, the first-ever expedition to Challenger Deep was made by the US Navy in 1960, reaching a depth of 10,912 meters.
Video clips by the Atlantic Production of Vescovo landing on ocean soil do point out an unidentified object in an otherwise barren-looking floor.
An American explorer has broken the the record for the deepest ever dive.
"It is nearly indescribable how excited all of us are about achieving what we just did", Vescovo told the BBC.
"That is my honest hope - to sell the system to an institute, government, or individual, that can use the whole diving system to advance marine science for decades to come". Walsh also took part in the recent dive but this time stayed above the water while Vescovo descended.