Seems like a plot point to a CW vampire show…
Cue Russell Edgington
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"The remains of more than one million people are buried on Hart Island, though since the first decade of the 21st century, there are fewer than 1,500 burials a year. Burials on Hart Island include individuals who were not claimed by their families or did not have private funerals; the homeless and the indigent; and mass burials of disease victims."
Primates are relatively unique in their complete lack of innate swimming abilities.