Alright. I looked it up some more. There’s not a lot of information about it out there, tbh.

Germans did coin the term “Schnorchel” for the air pipe in WW2 submarines (although they did not invent it). Which then later was used to refer to the diving equipment.

https://www.dwds.de/wb/Schnorchel

It’s derived from “Schnorgel” or “Schnörgel”, which is an old northern german slang/word for mouth or snout

What is interesting, as far as I can see, “Schnarchen” isn’t even super related to the same root as Schnörgel? And the real origin doesn’t seem to be really clear and is being discussed. It seems to be more related to schnarren, which is “making a repetitive rattling sound”