How many fathoms can a submarine go?

The depth a submarine can reach varies depending on its design and purpose. Most military submarines can dive to depths of around 800 to 1,200 feet, which translates to approximately 133 to 200 fathoms. Some specialized research submarines, like the DSV Alvin, can go deeper, while the deepest diving submarines, such as the Trieste, reached around 10,911 meters (about 36,000 feet or 6,000 fathoms) in the Mariana Trench.