Victor Vescovo will be the fourth person to go down to the deepest point of the Earth when he takes his submarine down to the Mariana Trench.

He and a crew of more than 40 people have been traveling the sea over the past several months exploring the deepest parts of the world.

The Five Deeps Expedition has already completed exploring the deepest points in the Atlantic, Southern and Indian oceans.

The Challenger's Deep in the Mariana Trench will be the deepest dive Vescovo will complete in his submarine Limiting Factor.

The submarine was built by Triton Submarines and is the first of its kind to be certified to full ocean depth, the company's President Patrick Lahey said.

The submarine can down to depths of 36,000 feet, he said.

"Our hope this will inspire a new group of explorers to come back and spend more time conducting more dives, collecting more samples and learning more about the origins of our planet and other things we can only find out in the deep ocean," Lahey said.

More than six and a half miles below sea level

He said he hopes more submarines will be built in the future so more people will further explore the vast ocean.

"We have a lot to learn," Lahey said.

The crew is using the most advanced sonar technology to map out the Mariana Trench to find the deepest point for the dive, mapping lead Cassie Bongiovanni said.

The deepest point is more than six and a half miles below sea level, she said.

It will take about 11 hours to get to the area Vescovo will dive from Guam.

Vescovo said it will take him about 3-1/2 hours to get down to the deepest point and he expects to stay down and explore for at least four hours before coming back up.

There will also be three robotic landers equipped with cameras that will be coming down to get as much footage of the ocean's deepest point as they can.

New species during every dive

Biologist Alan Jamieson said every dive during the expedition has found new species. He said the deepest parts of the ocean and the organisms that live there still aren't well known.

"There's all sorts of interesting things in this area we want to look at and the sub is giving us the ability to do that," he said.

He said one of the most interesting things he saw in the Mariana Trench were snailfish which looked almost like regular fish found in the surface.

They're transparent, but look like a regular fish, he said.

"It's not a horrible, deep sea creature that people think of," Jamieson said.

Vescovo said his vision to do the expedition came about four years ago, and using a lot of his own funding the team has been able to make his vision a reality.

He said he's always been an explorer and has already scaled the highest mountains around the world, so he thought he should try diving to the deepest parts.

Vescovo will make at least two dives, but he hopes to do as many as four dives within seven days.

"The ocean is very large and filled with life," he said.

First dive in 1960

One of the first people to dive down to the Mariana Trench, Don Walsh, is on the expedition as an adviser.

Vescovo said it's an honor to have him on board.

Walsh said a lot has changed since he explored the Marianas Trench with Jacques Piccard in 1960.

The technology has changed significantly, and isn't the same as he had almost 60 years ago.

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He said he didn't expect it to take decades before another person explored the trench. In fact, the two men in 1960 predicted it would be about two years before someone else dove the trench, he said.

Director James Cameron went down into the Mariana Trench in 2012.

Walsh said he hopes this expedition will encourage other people to do the same, because the ocean needs to be explored.

"It's very important because we got to somehow find the next generation that does this kind of stuff and helps us learn about our world," Walsh said.