Imagine swimming with a long pole attached to the front of you. Even if it would be thin, it would still disturb you very much. Also the disturbances in the wat

Imagine swimming with a long pole attached to the front of you. Even if it would be thin, it would still disturb you very much. Also the disturbances in the water created by the pole would make noise, that can be detected. Submarines are optimised in everything for absolute stealth, up to the point that the crew may not make any noise, like dropping a wrench.