Have you ever noticed that in most of the photographs and videos of the military submarines made in production or at the docks, the submarine's propeller is covered by some cover. Few people know for certain about why this is done and why closing the propeller is critically important for the crew and the entire fleet of the country.
Just two words answer this generally easy question: "industrial" and "espionage." The fact is that from the very beginning of the history of the appearance of submarines, there was a continuous race in the world of their engines and propellers with means of detecting submarines. This struggle reached its apotheosis after the Second World War, when submarines began to be used not only as a means of sea raider warfare and delivery of troops, but also as mobile launchers for tactical and strategic missiles, including nuclear warheads.
Do not be mistaken and think that the propeller is the most secret part of the submarine (albeit secret, of course, too). The submarine is literally crammed with high-tech secret equipment. The problem is that unlike everything else, the screw is in plain sight. Therefore, it would be nice to hide him in those situations, he is not in the water.
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This is because the size, shape, plumage and a number of other characteristics of the propeller, experts can calculate many useful characteristics for themselves about a particular vessel. And military intelligence is interested not so much in the speed of the submarine, but in its noise - how much it will be noticeable to search facilities. To prevent this from happening, in all countries with a navy, submarine propellers are carefully hidden.
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Of course, this mainly affects submarines of new models. Submarines aged, the characteristics of which are already known to everyone, no one especially tries to hide in the absence of such a need.
If you want to know even more interesting things,
then it is worth reading about why did the British during the war taught seagulls to sit down to submarines.
A source: https://novate.ru/blogs/170720/55339/