A man threw something away. He then paid someone else twenty dollars to try to find it but the search was unsuccessful. Later the man found it easily himself. How?

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The man fell overboard from a small boat at the seashore. He could not swim well and got into difficulties so he threw away the expensive and heavy binoculars around his neck. He was rescued. He then offered a swimmer a reward to dive down and recover his binoculars. This effort was unsuccessful. Later, however, when the tide went out he was able to pick them up off the sand.
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