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Divers almost never just randomly find a shipwreck underwater. Usually they'll spot some kind of object on sonar first, then dive to check it out.
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in Italy there are "archeological groups"[0] which are amateurs that mostly help with maintaining and popularizing archeological findings.

I think actually excavating stuff is beyond their purvue tho.

[0] https://gruppiarcheologici.org/

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