If the submarine only “swims” when a human tells it to, I think this is the sense intended by saying a submarine doesn’t really swim any more than a scuba tank breathes under water. People “swim” with the aid of a submarine.
If the submarine only “swims” when a human tells it to, I think this is the sense intended by saying a submarine doesn’t really swim any more than a scuba tank breathes under water. People “swim” with the aid of a submarine.