My wife and I don't have time to view TV so we do not even have such a machine. This was so the first time I noticed the matter.
The Dutch navy was very proud of its submarines but until 2014 it was assumed that these boats were to be the lasts. The yard where all Dutch submarines were built, and that also invested heavily in pressure vessels for nuclear power plants of which it produced none, has been closed after a lot of financial shenanigans. The Walruses are a quarter of a century old but were modernized less than ten years ago.
The Russian reaction is of course a demonstration of their confidence that they can find and if need be destroy these boats. I would expect the most modern nuclear submarine to be no more difficult to find than a modernized Walrus.