I have two somewhat related questions: Can a submerged military submarine let divers "out", and / or divers "in"? Do they have air locks / water locks? It wo

I have two somewhat related questions: Can a submerged military submarine let divers "out", and / or divers "in"? Do they have air locks / water locks? It would seem possible, enormously dependent on the depth of the submarine. Not just from the perspective of the integrity of the giant uboat but also the integrity of divers. In movies (which are always "accurate") they put people into torpedo tubes. Which I believe do feature some form of an air locks and ports to open and close. Not sure a person would fit, or if it is physically possible given the operation of the tube. If possible, can they enter the same way? My second question is if you can do deep sea fishing? (while submerged) Have fresh as can be sushi? I figure if you can let a person in and out, that person could go hunt fish and bring it back. They dont have windows but from sonar does pick up some sea creatures. You could possibly have a harpoon with a sensor on it you could extend to catch fish. It just seems it ought to be possible. With a nuclear submarine, I think, one of the limits to how long you can operate before requiring supplies is food. I hope a nuclear submarine has a way to creating fresh water from salt water as benefit for having a reactor. at least.