For years, I’d heard that there was once a real yellow submarine, beached and rotting somewhere in Puget Sound. It appears that the USS Menhaden [caution: speakers down!] was indeed a factual artifact, and even the description of her as “beaached” appears to have a basis in fact. I’d guess my recollection of this is based on news stories about the City of Everett scrapping the hulk of the Menhaden.