All I can imagine is that the prop completely corroded away and fell off, or the key way is somehow slipping and the shaft is just spinning within the prop. Any other hypothesis would be welcome.
Maybe it's just so fouled with marine growth that it's a big clump of mussels/barnacles? If that's the case, have a scraper ready for your diver buddy to correct it on the spot.
1983 Fraser 41
La Conner, WA
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Boating for over 25 years, some of them successfully.