Has there ever been a picture taken at the deepest part of Ocean?

Yes, there have been pictures taken at the deepest part of the ocean. The deepest point in the ocean is the Challenger Deep in the Mariana Trench, which is located in the western Pacific Ocean. The Challenger Deep is approximately 11,034 meters (36,201 feet) below sea level.

In 1960, Jacques Piccard and Don Walsh made the first manned descent to the bottom of the Challenger Deep in the bathyscaphe Trieste. They took several photographs during their dive, including one of Piccard holding a sign that says "U.S. Navy."

Since then, there have been a number of other manned and unmanned expeditions to the Challenger Deep. In 2012, James Cameron made a solo descent to the bottom of the Challenger Deep in the Deepsea Challenger submersible. He spent several hours exploring the area and took numerous photographs and videos.