if metal put a roofers magnate on the end of a rope on the end of a pole and go fishing. Otherwise a bucket with a Plexiglass bottom may help you see if you have full light. Also maybe borrow someones ice fishing camera. Careful not to disturb the bottom. From experience...disturbing the bottom creates clouds of silt which will render the item invisible due to great camouflage.
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It is not the most intellectual of the species that survives; it is not the strongest that survives; but the species that survives is the one that is able best to adapt and adjust to the changing environment in which it finds itself. Charles Darwin
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