James Cameron, noted film director, has reached rock bottom, literally, with his latest expedition deep inside the sea.

He has become the first person to travel solo to the deepest known spot on earth, 11km deep Marina Trench.

The maker of epic movies like -- "Titanic" and "Avatar" - spent seven years planning for his trip, largely in secret, to explore a frontier that remains more alien to humans than the moon.

Al Jazeera's Gerald Tan takes a look at his latest accomplishment.