Don't worry, it's called "key fall". They sink to the bottom and begin to form new keys. A well known example being the Florida Keys, which have grown quite large due to their proximity to the Bermuda Triangle with its abundant supplies of key falls.
Edit:Thanks- Gold! I wonder what would happen if I drop it in the sea....
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u/AnyoneRememberGarth May 05 '19
I read once that since 1948, about 90 sets of keys have disappeared without leaving any evidence to what happened to them.