Hollywood movie director, James Cameron, has completed his challenge to dive to the deepest point on the planet.
He successfully reached the bottom of the Mariana Trench in the Pacific Ocean in a specially designed one-man submarine, the Deepsea Challenger.
The trench is a massive 7 miles deep and is 120 times bigger than the Grand Canyon.
The Avatar director is the first person to get there in over 50 years.
Cameron managed to stay down in the trench for three hours.
He was able to collect samples to see what scientists can learn about life in the deepest part of the ocean.
Luckily for us the whole expedition was filmed and there are plans to make the footage into an epic 3D film.
As well as Avatar, James Cameron directed the films Titanic and the Abyss and that's where he got a taste for the oceans.