ANSWER:
His body was not retrieved or preserved as some people say.
https://islamqa.info/en/answers/72516/meaning-of-the-verse-so-this-day-we-shall-deliver-your-dead-body-out-from-the-sea
https://islamqa.info/en/answers/72516/meaning-of-the-verse-so-this-day-we-shall-deliver-your-dead-body-out-from-the-sea