Sharp-eyed diver finds crusader's ancient sword on Israeli seabed [View all]

A sword believed to have belonged to a crusader who sailed to the Holy Land almost a millennium ago has been recovered from the Mediterranean seabed thanks to an eagle-eyed amateur diver, the Israel Antiquities Authority has said.

Though encrusted with marine organisms, the metre-long blade, hilt and handle were distinctive enough to notice after undercurrents apparently shifted sands that had concealed it.

https://www.theguardian.com/world/2021/oct/18/sharp-eyed-diver-finds-crusaders-ancient-sword-israel
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A high school friend who is from Israel and was on the faculty of the University in Haifa is a marine archaeologist. I think she is now retired but I'm sure still has her hand in things. This is right up her alley.