How did the people in the submarine get out of the warehouse when sailing underwater?

Let me answer! People in the submarine can't leave the warehouse when sailing underwater! Submarines can only escape if they are suspended or submerged in the sea. There are generally three kinds. 1. submarine lift (submarine lower hatch exit) 2. Torpedo launching pipeline 3. The submarine lift has a small submarine (usually accommodating several people). Cabin 1 and 2. The pipeline needs to be pressurized by water injection, 3. It needs to be pressurized. Give me personal experience