How deep can a submarine actually go?

Transcript

How deep can a submarine actually go? Let's start with ordinary research submersibles, which can explore hundreds of meters below the surface. Military submarines usually operate at relatively shallow depths where they're designed for stealth and speed. Some can dive much deeper, although their exact limits are often classified. But to reach the deepest parts of the ocean, you need especially designed submersible. Thousands of meters down, the pressure becomes hundreds of times greater than at the surface. And in 2019, a submersible called limiting factor descended nearly 11,000 meters into challenger deep. At that depth, the pressure is over 1,000 times atmospheric pressure. To survive it, the crew sat inside a titanium pressure hole roughly 9 centimeters thick. That's the engineering required to take humans to the deepest known point in the ocean.

Transcribed automatically from the video, so small errors are possible.