No, they go down all the way to 8, that's a 64' pipe. There are only very few organs in the world that can do this and I'm not even sure if those stops are functional.

I have a 'virtual' version of that here and you simply can't hear it (you can feel it though).

See:

https://www.mixtuur.com/en/whats-the-longest-organ-pipe-in-t...