How deep have humans been able to go in a submarine?

Military submarines have different operating depths, depending on the submarine. You guessed this already, and the actual numbers are classified. From a few hundred meters to several hundred meters pretty much covers it. These are the "true" submarines, and they are the ones capable of independent operation for extended periods. If we move to the submersible, which is a "submarine" that is operated from a support vessel, the Trieste usually comes to mind. Trieste, which is of Swiss design, is a bathyscaphe (Swiss for "deep boat"). It was he deepest diving submersible, and it went to the bottom of the Marianas Trench at a point called the Challenger Deep. At about 10,900 meters, or some 35,761 feet, it is the deepest point in any ocean of the world.