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In water yes, but ancient shipwrecks are found all over the place because they've been buried under sediment. That is the case with this one, you'll notice in the article that they say, "the sand protection is leaving", which I take to mean that while it was discovered in 1993, it was covered up with sand and so protected from issues such as water movement, sun, and life forms. The sand is now eroding away and leaving the ship unprotected, hence the move, hence the article.

https://en.wikipedia.org/wiki/Archaeology_of_shipwrecks

Thanks. I wasn't aware of this!

It was also protected with a metallic coffin when discovered in the 90s

In Stockholm there now is, in addition to the well known Vasa museum, a museum about wrecks. It is called Vrak (Wreck) and is about wrecks in the Baltic Sea mainly. It is more of the interactive kind, no big wrecks on display, but smaller artifacts and audio/video/VR and so on. Interesting for those curious about the subject.

Of course the Titanic has been continuously rusting away too, along with being eaten by bacteria.