What is the maximum depth achieved by a man made submarine?

The deepest depth achieved by a manned submersible was achieved by the Bathyscaphe Trieste in January of 1960, manned by co-designer Jacqus Piccard (now deceased), and U.S. Navy Lt. Don Walsh.

Surveying the deepest point in the oceans, the Challenger Deep area of the Mariana Trench in the Pacific off of the Marianas Islands group, it descended to a depth of nearly 7 miles below the surface of the ocean - 35,761 ft, or 10,900 meters. That's over 1083 times normal atmospheric pressure on its hull at that depth, or 15,928 PSIA (lbs/square inch absolute).

Noted filmmaker James Cameron's Deepsea Challengerrecently (March 2012) completed the first ever solo dive to the Challenger Deep with him aboard, touching down at a depth of 35,756 ft, just a few feet shy of Trieste's dive.