Basic Parts of an Attack Submarine
This is the part of the submarine that holds the submarine's crew, machinery, and anything else that must be kept inside. The pressure hull keeps everything inside the submarine from being crushed from the high pressure of the water at deep depths.
These are built into each end of the submarine. These allow the submarine to dive; when they are filled with sea water, the submarine goes down into the water.
These are movable surfaces on the outside of the submarine that control the submarine's movements under the water.
The rudders steer the ship. Crewmen can turn a rudders to the left or right to make the submarine change course.
This is what powers the submarine.